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1.
(BYE-frend-lee) A person that seems to switch between liking and being nice to you and hating you. Almost like bipolar, except with their interactions towards certain people. This person is either a friend or a jerk, and they alternate with each personality a lot. If you really can't decide which one, then the person is a jerk and they don't deserve to be your friend. Bifriendly people are best avoided.
(name): hey, did you see my new youtube video?

MS: yeah, it was awesome

NEXT DAY (or less than one day)

(name): I discovered this new death metal band that's amazing

MS: stop talking to me! You're so annoying

(name): why the fuck are you so bifriendly?
by M@77 J@M35 July 09, 2012
 
2.
BYE-frend-lee) A person that seems to switch between liking and being nice to you and hating you. Almost like , except with their interactions towards certain people. This person is either a friend or a jerk, and they alternate with each personality a lot. If you really can't decide which one, then the person is a jerk and they don't deserve to be your friend. Bifriendly people are best avoided.
Matt: hey, did you see my new video?

Paul: yeah, it was awesome

NEXT DAY (or less than one day)

Matt: I discovered this new death metal band that's amazing

Paul: stop talking to me! You're so annoying

Matt: why the fuck are you so bifriendly?
by Xero _ Manifest August 07, 2011
 
3.
Someone that doesn't mind having sexual contact with the same sex, even though they are heterosexual.
Jana is straight but when she hangs out with her bi-sexual roommate Amy and her boyfriend, she can be quite bi-friendly.
by Flip-6 December 17, 2010