The act of secretively leaving your home and going partying with others at a non disclosed location and returningsurreptitiously and mentioning none of it those at home on regular intervals having those around you puzzled as to where you always go and why!
Some domestic cats go gerbatronning at night too.
Small imaginary animal. Habitat: old laundry, undergrowth in boy's rooms. Looks like a Russian hat/lemming/small groundhog type thing. Originates from Yorkshire. Considered extremely rare.
"Save the gerbats"
"SirBen, well-known gerbat conservationist"