To get an erection.
While so many of the submissions here claim that this has to do with undying love, obsession, passion, emotion, etc., its origins are simply the spring-like popping out of a good old fashioned boner.
when a girl walks in with an itty bitty waist
And a round thing in your face
You get sprung, wanna pull out your tough
'Cause you notice that butt was stuffed
-Sir Mix-a-Lot
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