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A relationship that never quite worked out but always down to fuck whether or not the two are involved with other people
Hey girl, I was with my boo-fling last night, it was hawt.
Boo-fling by Dr. Lush July 6, 2009
Related Words
Submerging oneself in their significant other and forsaking interaction with all others.
Every time Sarah's boyfriend comes over they boo up and won't talk to anyone else.
Boo Up by GrlCanSang September 9, 2015
girlfriend; old lady; a gurl you love
She's my boo boo.; Thats my boo boo.

boo woop 

A fictional, slide-whistle type noise imagined to be made during anal insertion. "Boo woop" can be used when describing anal sex, to get someone's attention, or just for fun in everyday conversation.
boo woop by BSG August 14, 2006
(noun.) A little mexican boy with white skin; who is very loud and crazy and quiet hilarious!
"Hey boo bean"
(As the little kid runs down the hall)
boo bean by dakota roo December 9, 2008