Upshift
(verb) A transitional moment during doggy-style or sex from behind when a male moves his erection from the vagina and inserts it in the anus.
"Why was she so upset at breakfast this morning?"
"Well, she is still pissed about me upshifting her last night. I guess it hurt really bad. Oops."
"Well, she is still pissed about me upshifting her last night. I guess it hurt really bad. Oops."
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