the implication of your father figure (you don't have one) being homosexual. brother to 'ur mom gae'.
liam: "hey, hey, hey dumbass, guess what?"
jordan: "what now???"
liam: "ur dad gae"
jordan: "Liam, I genuinely am concerned for you and your sanity. Please for the love of God, get help."
liam: "HEHEHEHAEHAHEAHEAHEAHEHAEHAEHAEA UR DAD GAE YOU GULLIBLE PRICK AAAAHAHAHAHAAAAHAHAAAAAAAAAAA"
a godly insult, that is undeniable but it is able to be deflected by the deity, uno reverse card.
josh "ur mom gay ahhahhaahaahaaa"
sean "*pulls out uno reverse card*"
josh "oh shi- *dies*"
"ur mom gae" is a (completely undeniable) accusation stating that your mother is homosexual (she is).
"ur mom gae"
"oh."