This is the name for the full moon in November- has to do with setting beaver traps in the olden days.
Nowadays it means doing the nasty under the moonlight nice and tight, on a cold late night
Or quite the opposite -a natural woman who is so pissed off, she moons you rather than putting out
Or What happens when you set a trap for a hot natural woman
Got myself a frosty full beaver moon, last night behind the subway station, or was that the tool shed--we was so hot I can't recall where the hell we was!
It means to go outside, which is similar to "see some sun", but at night. Usually used towards gamers, but can be used towards any person who stays indoors for long periods of time.
"Hey man, you been gaming all day. Please see some moon"