Green’s Dictionary of Slang

GMT phr.

(US) angry, lit. ‘gets me tight’.

[US]The Cut (NY Times Mag.) Mar. 🌐 GMT — Teens don’t fuck with no Greenwich Mean Time; teens don’t fuck with time zones, period. Instead, GMT stands for ‘Gets Me Tight’ [...] As in: ‘It gets me tight when by boyfriend doesn’t like my Instagram posts.’.