Billy

Billy is a British slang term used when someone sent a text (most likely on discord) that made their friend laugh out loud in public

Blev: "Ur mum"
Devito: "bro you made me billy

Present tense
Blev: ur gran is bad
Devito: bro im billy-ing so much rn stop

Past tense
Frank: ur uncle felt me up
Reggie: I almost billied you b word