To sniff a males genitalia. Starting at the pubes(body of rat, as in the fur) then sniff the penis(this being the tail of the rat).
Guy 1: Dude guess what!!
Guy 2: what???
Guy 1: I just paid Earl $50 to give me a rat sniff!!!
by LMFMC FUCKER June 9, 2009
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An insult suggesting that a person has similar physical features to a rat that sniffs.
Amy is such a sniff rat...
by mitchb611 August 29, 2006
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an under-priviledged pathetic human being who worships those above them in a manner that is degrading to them and will stop at nothing to please.
davy worships chris so much that he is becoming an anal sniff rat
by chris maginnis December 23, 2005
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