An adjective (with emphasis on the second 'boo') used to describe anything and everything that sucks, whether it be a bad situation, something disappointing, etc, but isn't extremely terrible. Usually placed at the beginning or end of a sentence.
Jesse, I changed the date for my party just for you and now you can't come? That's boo boo.
Ahh, boo boo! I forgot to write my paper!!!
Seriously? He gave us homework on the first day of school?! Boo boo.
Ahh, boo boo! I forgot to write my paper!!!
Seriously? He gave us homework on the first day of school?! Boo boo.
by VonKeiss October 17, 2008
Get the Boo Boomug. 
1) Another term for feces or defecation
2) Using as an adjective to describe poor mood or feeling badly
2) Using as an adjective to describe poor mood or feeling badly
1) Did you see how much booboo was in that diaper?
2) I feel like boo boo! I think I may have the flu
2) I feel like boo boo! I think I may have the flu
by Wizzyforreal November 27, 2011
Get the Boo Boomug. An absolute fucking legend. Hot asf but also cute. Trust-worthy as hell, beautiful, and a best friend. Boo-boo is a name for someone special in ur life who u fucking love a lot because they’re amazing asf
by Goonk.C June 30, 2018
Get the Boo-Boomug. by wolfman yo June 30, 2006
Get the boo boomug. according to what a white boy told me, boo boo is "ebonics" for poo poo what made him think this is beyond me
by Rick James April 18, 2004
Get the boo boomug.