Screwing a girl on the day you first met her. When telling someone you got a hole in one it must be followed by describing how hot she was in par terms; a par one being ugly, a par 5 being georgeous and put-put being gross and skanky
"Hey man, I got a hole in one last night, but it was put-put."
During intercourse, the male pulls out right before he cums, and then he ejaculates and makes it perfectly into the belly button of the girl. Also applies to malemasturbation, shooting your load in your own belly button.