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2.
1. A slovelnly dressed man. Often mistake for a homeless man. It is the combination of "fucking" and "monster". Fonster = Fucking Monster.

1. Also known as a sandwhich that consist of all available condiments.
1. Man, did you see that guy Dave? He was wearing busted timberland boots, dirty jeans, a tight polo shirt, and he had pubes growing off his chin...what a fonster!

2. That is quite a fonster sandwhich you got there...mayonaise, lettuce, tomatoes, ketchup, pepper, salt, vinegar, ham, cheese, pickles, onions, and relish.
by T. Sroka November 11, 2007
 
1.
1. A hoagie from WaWa or any other hoagie making place that includes all possible ingriedients all at the same time (i.e. An Italian Hoagie with mayonaise, tartar sauce, horse radish, lettuce, tomatoes, pickles, onions, ketchup, salt, pepper, etc. etc.)

2. A person who is a fucking monster, for being slovenly dressed or hobo-looking in his dress. (Also See Fonstress for the female version).
That hoagie has 72 toppings...that's a Fonster!

Dude, you put on 30 pounds in the past week eating nothing but hoagies and mayonaise, you are a Fonster!
by Tom Sroka October 27, 2007