No Diddy is a phrase used when someone says something that sounds a little gay but in reality doesn't have anything to do with homosexual activity. Similar to the use of "No Homo" or "pause". This phrase has become popular because of the Musician P Diddy's crimes in 2024 in his "Diddy Parties" where he got extremely freaky and is speculated to have participated in activities with and around men.
P: Hey did you play tennis with Jamal yesterday?
Didler: Yes I did but his balls were really large for no apparent reason.
P: ...
Didler: No Diddy.