A foreplay sex move. When a male or female with a mustache splits another persons butt cheeks (as Moses did the Red Sea), rubs their mustache in or around the rectal hole area. In other words, when you rub your mustache in their butt crack for sexual pleasure, or for fun.
"Hey there nice mustache! Would you care to give me a Furry Moses?"
"Damn, I was with a girl last night, and I gave her a Furry Moses!"
"You know what's better than sex? A Furry Moses!"