naff twat
a useless, annoying wanker who pretends to like you until his idiot friends turn him into a naff twat and he starts being a total pain in the arse just to ruin your day.
He said he'd come to my concert, then stood there texting his idiot friends and ignored me.
He said he'd help me clean my room, then just sat there eating chips and making a mess.
He said he'd come to my birthday, then showed up late with his stupid mates and ruined everything.