1.
Mispelling of fuck, often put in speed chatrooms.
"Go fiuck yourself!"
See fuck, fyuck, suck, blow, 69, 420, m8, teh, ya, o rly, ya rly, oral, geg, bara, cunt, dick, fag, piss, wtf, ftw, na, p, q, w, e, r, t, y, u, i, o, a, s, d, f, g, h, j, k, l, z, x, c, v, b, n, m, '