skin fencing

The explicit act between two (or more) men in which their erect genitalia come into direct contact.

"Jim and Tony won't be able to make it tonight. They are rather caught up in a bout of skin fencing."

Fence hang

When one is outside and hangs on a fence whilst squatting for a shit

Fam im busting for a shit but there's no toilets!

Dude we're on a field, just fence hang!!