The act of not giving a damn and doing as little as possible.
Shammers are usually lazypeople that smoked lots of weed back in the day and joined the Army, thus becoming shit bags and shamming out on everything. Shammers also carry around a belief of FBGM.
A person (usually male) who wrangles poon for a living, likes smalking smike smish, is more likely than not lead harmonica player for a country/punk band.
Did you see that shmameron smoady unfold the booms on that beho?