You can:
Call a game that's only on one platform (be it 360, PS3, PC, Wii, DS, PSP, 3DO, whatever) an "exclusive."
Call a game that's on one console and PC or handheld a "(name of console) console exclusive."*
Call a remake an "exclusive."**
You cannot:
Call a game that's on more than one platform (be it 360, PS3, PC, Wii, DS, PSP, Atari 2600, whatever) an "exclusive."
Call a game that's on one console and PC or handheld an "exclusive."
Call a port an "exclusive."**
*Note: Games with the same name but completely different content are exceptions to this rule. For example Gran Turismo on PSP vs PS1
**Note: Ports are generally the same generation and a transfer to another platform with minor changes. Remakes are generally at least a generation apart, and usually have some major changes in graphics or additions in content.
To be clear this will be enforced both ways. If someone makes a thread about 360 Exclusives and correctly lables 360 Console Exclusives and you come in bitching about "oh but those are on PC too" you will be moderated for trolling.
This has now been added to the forum rules, so I am locking the thread, which is now linked to the rules.