A wimp, someone who pretends to be "buff", or "macho" but actually dosent do anything.
oddly enough...sound like panzer, panzerfaust, and panzershreck which were all feared weapons of the ww2 era..
tom- wow bob, ure such a panzy, you wont even go down a 4 foot slide!
bob- shutup tom, i'll kick your ass!
tom- ok, do it
bob- well, ummm.......i dont feel like it.