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An individual who is undeniably bro, but not everday. The rest of the time, he may as well be pmsing.
Are you gonna hang out with Justin today?

No idea. That fucker is so bropolar, I never can tell with him.
bropolar by albinobro October 13, 2011

boipolar 

ADJ: vacillating affections for more than one boy; especially when rapid and for no apparent reason
"Yesterday she was flirty with me; today she's hanging all over that asshat over there. She's so boipolar."
boipolar by Ninja Neologist March 13, 2009

boypolar 

When one posseses the inability to decide on one romatic interest- in this case, of the male variety. Includes frequently changing one's mind about which boy one wants to be with.
1. Katie: OMG. I just got a text from Matt, he is going to meet me at the bar tomorrow night.
Cailee: Wait, I thought you had a date with Craig, that you were super excited about.
Katie: No, I think I like Matt- he’s witty.
Cailee: ugh… you are so boy-polar!

2. Katie is boypolar, last night she liked Craig, this morning she woke up with Matt.

Boypolar 

Extreme mood swings and change of opinion of a boyfriend due to relationship upheaval or drama.
Amanda, yesterday you loved Andrew, this morning you wanted to break up with him and now you're sad because you think he's going to break up with you? Stop being so boypolar!
Boypolar by OVSkankHo July 17, 2011

boypolar 

adj. having a crush or mulitple crushes that are constantly changing
yesterday, she liked russell but today she hates him, she likes jon now. gosh she's so boypolar!
boypolar by rorothepenguin September 29, 2009

Boypolar 

When a girl is having trouble deciding between more than one guy, she is boypolar.
Wow, you are so boypolar.
Boypolar by purplepanther333 March 8, 2011