The act of stretching one's scrotum/nutsack over a bitch's mouth; the effect is reminiscent of the inflation of a bullfrog's throat-bubble-thingy. Nooch.
Jesus dude, you should have seen that slut's face when I bullfrogged her!
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Phenomenon occuring during anal sex, when the penis is partially retracted from anus quickly, slightly drawing out the purple-hued interior wall of from the sphincter, creating a sock-like effect around the penis, e.g. a "purple sock" pulled over the penis.
"Buddy, I was crushin' ass on this bitch so hard... I was totally pulling out the purple sock."
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