No Diddy

If someone says “No Diddy” (usually used after a statement that could be seen as gay, fruity, or homo by the other person(s) in the conversation), they are indirectly stating that the previously stated sentence, text, etc. was not intended to be said in a homosexual tone.
Basically, the new ‘No Homo’.

Person 1: Hey, whatcha up to today man?
Person 2: Nothing much really, about to get in the shower then sit there naked for a while, no diddy.
Person 1: Glad you said no diddy, because for a second there, I thought you were inviting me to have sex dude.