gigajimmy Share definition Flag A gigantic jimmy, the opposite of a millijimmy or microjimmy. "Peep that gigajimmy over there in the tight black jeans." "Bullshit, he's got to be stuffing" gigajimmy by Johnny Fitswell January 10, 2018 0 0 Get merch Get the gigajimmy mug. Buy Now — $32.95 See more merch