ATC

Always.Thinking.Cum
A phrase used by gay youths to talk about people that they perceive as being gay.

Hey, you know that guy over there, he’s ATC.

Doing a Duggan on it

Going out with a someone of the female species, despite being gay,

Aka doing a dugmeister on it

Yeah he’s doing a Duggan on it

She’s only his Duggan job