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.
Helicopter with a hole in one is when you have a apparatus like a harness on a pulley system and you are swinging your partner lowering them until they make it in your hole! If you can manage it in one try you have a helicopter with a hole in one!
Suzette was so excited to have Eddie in her sex swing harness she pulled on the rope so hard that when Eddie was coming in for his landing the roof gave way! To Suzette's surprise he had made it well into her hole! She scream with glee, FINALLY, A HELICOPTER WITH A HOLE IN ONE!