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1 definition by theguyinthecornerXX

 
1.
When someone (usually a male) hangs upside down while someone else does either one of the following given:
1) Gives you a blowjob
2) Gives you a handjob
3) Fists you. Usually associated with homosexuals.
OR
When a female hangs upside down and you insert your dick in her vagina.
Guy 1," Get on the monkey bars and get into an underdog!"
Girl1 -"Orrr, You can get into an underdog and I can give you pleasure."

Guy 2 -"hey, can you get into an underdog?"

Guy 3 -"Sure."
by theguyinthecornerXX October 07, 2010