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someone gross, whom you do not like.
Matt is so ugly, and he keeps hitting on me, i mean WTH, he is such a nasto!!
by Frieda + Liezel August 19, 2008
very gross and nasty. the grossiest thing. makes you wanna barf.
"Chris we are having cabbage for dinner"
" ew mom. nasto"
by Colleen Bo Bean April 11, 2008
someone nasty, perverted or ugly looking.
Oh my god! You're such a NASTO!!!
by ShoujoStephie May 12, 2004