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1.
activities that occur under a waterfall of urine or any other body fluids
last night i was singing in the rain with bill
by dr.pube November 19, 2010
 
2.
When a group of three to five individuals jump someone, knock them down, and proceed to violently kick them in the ribs and face repeatedly (usually with steel-toed or reinforced toe boots). Usually done while belting out lines from the popular song, "Singing In The Rain". Inspired by Stanley Kubrick's film A Clockwork Orange.
Let's take down Jake tonight. That motherfucker, we'll be singing in the rain over his ass!
by Penis Christ February 03, 2005