When dealing with a gaggle of peni, you are dealing with a group of males with penis'; or collectively, Peni. (Peen-eye)
The group will often be talking about sex and girls, or trying to "score" with the prime breeding subjects in the area.
"Hey, did you go to that party on Saturday?"

"Nah, There was a massive gaggle of Peni on the prowl"
by Frozen Ninja December 3, 2009
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