Top Definition
to insert ones thumb into the anal or vaginal orfice.
i said "thumbfuck", you dumbfuck!
To be constantly on your phone texting or messaging non-stop.
Classmate: "Has anyone talked to her about the break up?"
Me: "Na. She's been thumb fucking her phone all day and won't talk to anyone."
by MaddHatter June 27, 2016
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