The only uses of "cram" I was familiar with were literally crowding stuff into a container -- like "he just crammed the clothes into the suitcase" or referring to last-minute study sessions when you are trying to learn a whole semester's worth of material in a few hours. You didn't seem to be referring to either of these meaning, so I checked Urban Dictionary, and, frankly, I rather wish I hadn't. I would consider any of the sexual meanings of these expressions to be distasteful, vulgar and offensive.
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MUSCOVITEOnce again, my apologies!