Top Definition
When a woman is performing fellatio or another sexual act on a man using the hands, a Welsh Wiggler is when the aforementioned woman flops the man's penis back and forth as opposed to the regular up and down motion.

A Welsh Wiggler can also be done by a man on himself.
Tyrone: "Dude, Sally just gave me a Welsh Wiggler!"

Richard: "Awesome, man!"

Tyrone: "Yeah she flopped my penis back and forth!"
by Chimmeister April 28, 2011

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