What it means
Means mad or seriously annoyed, usually at a person, and it nearly always shows up with with. If you say you're thick with your mate, you're not calling them stupid, you're saying you're raging and not speaking to them. Handy for family rows, petty grudges, and any time someone has done your head in.
Usage examples
"Mammy was thick with me when she came home and saw the gaff destroyed, bottles everywhere, and the sink stacked to the ceiling after the party."
"She's still thick with her sister over the wedding seating."
"Don't be thick with me all day just because I forgot the milk."
"He was thick with his brother for a week after the car got scraped and nobody owned up to it."
"Don't start going thick with me now, I only took the piss."
Where it comes from
Plays on thick as dense and heavy: in Irish English a thick mood is a sullen, weighted-down one, so being thick with someone is carrying that heavy temper and the silent treatment.
