a /b/tard is one who actively posts or lurks on the /b/ board at either 4chan.org, notfourchan.net, 7chan.org, 12chan.org, iichan.org, ebaumsworld, ytmdn or countless others. to those who it concerns, yes in writing this i am breaking rules 1 and 2, but you will get over it.
there is so much more to it than this, but that is all you need to know.
a /b/ tard is the guy who tells the cripple ahead of him in line to hurry up.
a /b/tard is first to get to the window to see the car accident outside.
a /b/tard is the one who wrote your number on the mall's bathroom wall.
a /b/tard is a failing student who makes passes at his young, attractive English teacher.
a b tard is the guy loitering on Park Ave, the one that's always trying to sell you something.
a /b/tard is the one who handed his jizz-drenched clothes to Good Will.
a /b/tard is one who introduced you first to Goatse.
and so on and so forth
B: fuck that b tard man hes a twat anyway.
man: stop following me you b tard.
B tard: i just wanna be your friend.