What are the Cimbri?

[Frostwulf]

Germani collectively refers to all groups east of the Rhine and North of the Danube. The Baltic Lugiones were Germani, the Celtic Ingaevones were Germani, and the "Germanic" Sweboz were Germani as well. To the Romans, it was a term based on geography and not ethnolinguistic identity. It's just like "Middle Easter" - anyone who dwells within that geographic area is often called a "Middle Easterner" yet there are Persians, Arabs, Turks, Assyrians, Armenians, Pashtuns, and many other ethnolinguistic groups living within the middle east - yet they are often all lumped under "Middle Easterners."

I don't agree that the Ingaevones were a "Celtitc" grouping, and the Lugiones as far as I know while still up for debate the majority consider them "Germanic".

Beginning with J.Caesar we have the known(to the Romans) "Celtic" peoples of Volcae Tectosages, Boii, and Helvetii living within the geographical area that by your definition should label them as Germani, yet they are not. These people still retain their "Celtic" ethnic tag, not the Germani one. One the other side we have the Germani cisrhenani and by using the geographical model they should be called Belgae, Gauls or something other then Germani, yet Caesar refers to them as Germani.
Moving on to Tacitus you have other tribes by the geographic model your using the Contini and Osi should be Germani, yet they are labled as non-Germanic. If the Ingaevones were "Celtic" as you claim, that really wouldn't have much bearing because Tacitus would have believed them to have the same language and culture as the rest of the Germani. He distinguishes those who do and those who don't.
But I believe in Tacitus these sentences go entirely against your geographic model:

As for the nations of Peucini, Veneti, and Fenni, I am unsure whether I should assign them to the Germani or the Sarmations. To be sure, the Peucini, whom some call Bastarnae, are like Germani in speech, way of life, mode of settlement, and habitation;....46,1

The Veneti have taken a great many customs from the Sarmatians, for in plundering forays they roam through all the forests and hills that rise between the Peucini and Fenni. Still, they are more properly classsed as Germani, because they have fixed homes and have shields and take pleasure in moving fast by foot: all these things are at odds with the Sarmatians, who live..... 46.2

Now how can one claim that the Romans used the term Germani for geographical people when there is Caesar and Tacitus saying things that don't widely fit into this model. The Bastarnae aren't even near the region.

Right, to the romans, "Germani" simply meant east of the Rhine and north of the Danube. it wasn't really an ethnolinguistic identity to them as it is to us nowadays.

Tacitus talks of language and culture when classifying the Germani in the above quotes, not of geography. Caesar talks of geography at the beginning and then refines it more.

At the very least, their material culture more closely resembles that of the Celts than that of the Jastorf.

Where can I read about this? Is your source Freibe?