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1.
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!
by N D July 16, 2011