actually a mute is when you actually grab the ski, and can be crossed or uncrossed. there are also different variartions of it. ie. nose mute, high mute, uncrossed mute, opposite/reverse mute, fake mute.... etc.
and iron cross was used earlier on, when the skis would be crossed, with no grab. and i believe with a spin they ised to call it a helicopter or something.
but by no means is it a term for illiterate homos...