While he's resting or while he's bench pressing

from Asher Roth – Muddy Swim Trunks Lyrics on Rap Genius

Meaning

Bench pressing is obvious — if you touch a man’s penis while he is straining to lift heavy weight, he might be startled and drop the bar on himself causing serious injury. Plus the penis often experiences shrinkage while exercising!

Resting is another story — sometimes it’s the only way to get rid of that morning glory

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