grinfucking 

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.

grinfucking by ckd December 5, 2003

Grinfucking 

when you pretend to be really nice to someone and give them fake compliments

(Grinfucking) Gianna: happy birthday emily schneider! I hope you enjoy to day
(A dimwit) emily: wow that is super cool and awesome that you congratulated me on my bday!!

Grinfucking by gianna the boketto June 27, 2019

gifuckingargantinormous 

Gi-fuck-in-gar-gant-in-or-mous: (jI'-fuk-ing-gar-gant'-i-nor'-mus) adj.
Definition: Exceedingly large; large beyond all human reasoning.
Related Words: gihugic, ginormous
Also: gi-fuck-in-gar-gant-in-or-mous-ly (-ly)
Synonyms: None. The word denotes incomparable hugeness.

A combination of ginormous (gigantic + enormous), gargantuan, and the superlative fucking.

Holy Mary, Mother of God! That guy is gifuckingargantinormous!

gifuckingargantinormous by N D July 16, 2011

Gifuckinggantic 

An obscenely large quantity that can only truly be communicated with the term "fuck" interlaced into it

- "Wow, that person in the flower-print mumu is gifuckinggantic!"

Gifuckinggantic by cooldude5000 August 5, 2010

gripfucking

When one vigorously goes at it with another in the bedroom. Very similar to on the nature shows when the lizards clasp each other with their paws and go at it like there’s no tomorrow.

“So get this, I was gripfucking this chick last night and my shit is so sore”

gripfucking by MinkyManlyOk January 16, 2021