Summoning the monkey: a euphemism for masturbation.
Originally coined by Liam O'Brien of the Critical Role D&D ensemble, and subsequently (maybe) made canon by DM Matt Mercer's explanation that summoning the monkey is the past time of many a wizard in their early years of training.
Sam: Have you seen Liam?
Laura: He's in the bathroom, probably summoning the monkey.
Sam: Thanks, I think I'll join him.
1. A hopeless situation with no satisfactory solution
2. To fail spectacularly, as in 'screw the pooch'
3. To continue fighting though you cannot win
4. A legendary bout of partying
"Beating your head against the wall, fully aware your
cause was already lost. This was banging the monkey."