The Roon Effect is when your friend (male) starts of as a straight person when you meet them but then they start having more feminine or gay traits as your friend ship progresses. This might happen because of who they play with and if their testosterone is low.
Person 1 : Bro you were so normal when I first meet you, you would make no weird comments back then. Did you get hit by the roon effect?
Person 2: The roon effect got me, I'm more fruity and i'm not comfortable being masculine.