What is Grinfucking?
1.
grinfucking - the act of being (pretending to be) really nice to someone's face and then turning around and stabbing them in the back
past tense: "grinfucked"
related: "grinfucker" - one who commits such acts
Laura told me she loved my outfit, then told Mike I dressed like a whore; I can't believe she grinfucked me like that. What a grinfucker.
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1.
A way to say "whatever it is, it's okay" or "everything is okay".
Damn, all we have is this hammer. Whatever, ..