Re: wp-bb, is it possible to define conditional tags for bbpress?
No problem. 
Option #3 was a throwaway possibility, not really meant for actual use as it’s rather silly.
whatever && !is_bbpress() means, literally, that whatever has to be true AND is_bbpress() is not true. The ! operator inverts the boolean meaning, so true becomes false and vice versa. If is_bbpress() is true, ! makes it read as false. If false, it makes it read as true.
By the way, the backtick ` that indicates code is on the top left button on most English and European characters.
