When an over-eager teenage male has sex for the first time and straightens out like a board when he ejaculates, putting all his weight on his partner and laying stiff for a few moments of awkwardness.
"Harry totally jizz planked me and then just laid there on top of me for like five minutes grunting and wheezing, I almost suffocated beneath him"
by Trollbert June 29, 2022
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