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The act of drawing the upper lip down over the top teeth, placing thumb and forefinger of one hand together under the nose then separating thumb and forefinger and running one down each side of the mouth while simultaneously opening the mouth wide – as if stroking an imaginary goatee whilst yawning.

A carnal gesture usually used by men, normally involuntarily, when assessing a serious piece of ass that has just walked by.

Derived from "stroking around the outside of the mouth"
Bro, you totally strouthed when that chick strutted her booty.
by SpoonerRuns February 04, 2012
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