See also: get the fuck on and shitted on.

A slang phrase meaning, "If you don't hurry up and do something, you are gonna miss out." or "If you don't do this, you are gonna feel like a dumb shit (like you've been 'shitted on')and regret it later."

Note: 'before' can also be shortened to 'fo' for a more urban slang feel.
Tom: Man, I wanna go get that O of kind bud dude accross town was gonna sell me for half price, but I'm so lazy I don't feel like driving.

Greg: Dude, you better get the fuck on before you're shit the fuck on! Are you fucking retarded?
by NINerd October 4, 2008
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