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the act of a prisoner in jail pushing his/her butt against the fence so that the male on the other side can have sex with him/her and the imprint of the fence is left on their butt looking like a waffle.
how did your day go in the yard today deebo?

"good...me and one of the girls from the sister prison had a good waffle butting session."
by moosenuk February 22, 2009
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