Entering an establishment (such as cafe, restaurant, bar, etc.) and being asked to leave for no apparent reason other than the staff being a bunch of bitches, one politely nods in agreement while slowly burying their hand down their pants, shitting in their palm, then violently throwing it against the wall as they exit.
My girl and I had a date at this ritzy French restaurant but I guess they didn't like what we wore because they told us we weren't allowed in. I was mad, but while we were leaving I gave them a steaming CincinnatiMonkey Toss and we found a much better Italian place across the street.
A foosball goal scored when a player on one team shoots the ball, and it is rejected by the other team into the original shooter's goal. Derived from a monkey tossing its masturbatory result at an unsuspecting victim.
There are various forms of the monkey toss, including the D-Toss (defender scoring on a toss) and the Bank Toss (a monkey toss that goes off the wall before going into the goal).