Means someone, usually female, is in exceptional pleasure; usually found in pornographic manga.
Tl;dr what moaning sounds like
Sam: Hardy daddy, aah~
Fred: What the fuck this is history class
Commonly used by people who are milkmen
I am the milkman. My milk is delicious. Special delivery today!
One of my friends, they’re the biggest stud I know and is irresistible to everyone except for me.
Lafrenard: Wow Michael Pella is the biggest stud in North-Western Ontario
Timbits: Yeah he’s massive
Morrow: yeah
Morrow: