daddy is a sexual term used by young females as a exclamation of appreciation for males, preferably to photos of guys that are absolutely hot as hell and they kinda want to smash.
Girl1: hey check out this photo Dominic just posted on his instagram!
Girl2: OMG daddy fr~
Is when a horny girl says to their boyfriend
And it can also be used in a sentence pretending they are fucking or when they are fucking
Oh yes daddy please do it harder
Something that is said before, during or after sex and has been used as a slang to turn people on. Some people have this as their kink
Person 1: wanna do it?
Person 2: yes daddy!