When someone goes to pound their fist against yours, you move to the side and make a peace sign, and if you look at both hands together, you've made a SCHNAIL! You must yell "SCHNAIL!" when this occurs.
Yours is the head of the snail and the other person is the shell. Therefore: snail + shell = SCHNAIL!
He went to give some love, but instead he got schnailed. SCHNAIL!
An art similar to cock blocking. Where as cock blocking is in front view of the victim, Schangling is somewhat more devious. To sneak over to a girl in a bar or club when the person who was chatting her up,is on a short term absence " smoking , toilet or at the bar". Schangling is an act of espionage carried out from a distance, carried out only at the right time.
How did you get on with that girl Paul? "No good, she was talking to him when I got back from the toilet, he must of been Schnagling me"