Today You Learned - a spinoff of the term TIL, or
Today I Learned. Used when responding to someone who realizes
something new that they've learned.
OP - "Me and my girlfriend love
edging. I drive here crazy in
bed because she never knows when I'm going to take her all the way, or
edge her and prolong our session."
Commenter - "Oh wow, I just realized my boyfriend's been doing this all along! Didn't know this was actually a thing."
OP - "Well hey, TYL. Glad I could help, I guess."