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1.
1) A pejorative term for a Pittsburgh Steelers fan(s) that

either:

a) Lives outside Western Pennsylvania, or

b) Shows up (normally in bunches) in an opposing teams

stadium and/or City wearing Steelers gear. And though

not always the case, can be spotted with the infamous

Terrible Towel.

2) Can also be applied to Penguins and Pirate fans too
Tom: "Hey, I thought we're in Mile High Stadium, Why am I seeing a bunch of Steeler Fans with the terrible towels?!"

Rico: "I call them the Terrible Bowels, they show up just about everywhere outside Pittsburgh".
by Patriots Fan March 25, 2010