This is the singular variant of seagulling. It takes a brave man to do it, but it involves hiding on your own in an area that you know a group are about to have sex in. When they finish you run round them flapping your arms like a seagull preferably ejaculating all over the group having sex.
The crucial difference is that you have to do this on your own.
AKA Solo - Seagulling
Solo - Gulling