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when you are engaged in oral sex OR receiving a hand-job just before you are about to ejaculate, she then pokes you in between the anus and ball sack.
while I was on the computer, looking up many various words on the Urban Dictionary website, I looked over beside me, and all of a sudden, I see my roomie receiving quite the vigorous Grundle Poke I have ever seen...
by R.Tripp February 03, 2011
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