Another, more slangy version of saying "Fuck that Shit!".
Usually only used when speaking to someone you know, and
sometimes used with "
Dude" proceeding it.
Almost exclusively used when honestly hating an idea or concept, but not used in a sexual sense at all.
Johnny: "Hey, lets go to the movies AFTER doing our homework.
Tommy: "
Dude, F that
Ish! I say we go to the movies first, and F the homework!"