reverse-mush 

noun:
Person who restores good luck in the presence of a mush, or person who brings bad luck.

verb:
To reverse the bad luck of a mush by acting in the opposite way.
To not accept the truths or corollary truths proposed by a mush.

noun:
Even after the mush entered the room, the house of cards remained in tact, likely due to the presence of the reverse mush.

verb:
The mush attempted to ruin my luck by prematurely offering congratulations before the game was officially over. I did not accept his congratulations and continued to play as if I was not in the lead, thus reverse-mushing his effect.

reverse-mush by Jahvid September 27, 2011

reverse mushroom caps 

This occurs when a person's nipples appear to look like mushroom caps inverted into their body. Most often used for storage.

Did you see that full on fullopian fungus Richard is storing in his reverse mushroom caps?

reverse mushroom caps by LLAMA LEGS AND CABBAGE NUTS INC. January 15, 2008

reverse mushroom cloud 

The act of evacuating one's bowels so quickly and violently that the debris forms a mushroon cloud in the toilet.

We ate at that new mexican restaurant and when I came home I dropped a reverse mushroom cloud in the toilet.

reverse mushroom cloud by mikeyhonda January 16, 2005