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1.
the act of gettin on your knees and suckin cock. the past tense version of goin down
that bitch went down on me
by lazyassloser March 25, 2004
 
2.
In motorcycle riding, it's another term for having an accident or crashing.
Did you hear that ole dude that rides the Gixxer 750 got cut off by a cage driver and went down hard?
by Coolhandchuck July 29, 2008