The act of two men sitting or standing side by side, and extending their hand towards their partner's penis and jacking off creating the "X" from the intersections of the arms.
{First off, I sometimes wonder if this Urban Dictionary was created as some kind of breeding ground for idiocy...
In the Marvel Universe, A particular group of Mutants (Homo Superior as opposed to Homo Sapien) with special abilities who have grouped together to defend humanity as well as they can. Although a significant portion of humans hates mutants, they still strive forward to show mutants are not all evil as many think.