a guy or girl who is not your "significant other" but you have sex with and he/she is your best bud.
by Killa Cat August 17, 2011
Basically, another way of saying something is ass, or bad, or terrible. Can be used on yourself or others.
Person 1: I feel like ass today.
Person 2: Nah you feel like Boo Boo Stank!
Player 1: oh my GOD you are BOO BOO STANK at this game!
Player 2: Kay.
Person 2: Nah you feel like Boo Boo Stank!
Player 1: oh my GOD you are BOO BOO STANK at this game!
Player 2: Kay.
by obama4eva February 8, 2011
Dezis your boo boo stank stank.
They have been friends for five years. Yeah he's her booboo stank stank!
They were in ninth period with Lex and Kyle and Justin said boo boo stank stank.
They have been friends for five years. Yeah he's her booboo stank stank!
They were in ninth period with Lex and Kyle and Justin said boo boo stank stank.
by Mordecai2017 June 18, 2013