Means to Fart In Self. When you're in a situation, like with a new boytoy (or fish) and you have to fart so bad that it goes up into your stomach making a loud rumbling, grumbling, farting sound. To which you say "hmmm I must be hungry" in a sad attempt to cover up.
Claire - Oh man, I was at Rusty's this morning, and my gas was so bad that I was Fissing like crazy!
Ann - Dude you should have just broken the ice and dutch ovened him
Ann - Dude you should have just broken the ice and dutch ovened him
by missj1982 December 12, 2009
Get the FISmug. by Jenny Any Dots April 28, 2006
Get the fi.mug. what's his phone number? fo-fo-fi-fo-fo-fi-fo (445-4454)
by futuretrucker January 24, 2005
Get the fimug. A sock or towel used in jacking off to eliminate hand to penis contact. Normally found in bunks in jail cells, boy scout camps, and tour bus bunks. They should always be handled with gloves or a stick due to the nature of the goo they normally contain.
by twistednick December 28, 2009
Get the fi-fi bagmug. 
