One who chokes on a males penis when sucking it. It is a negative term for anyone who give a "bad" blow job. A throat clobber'er tends to cough on the penis after choking.
"Dude, I was getting this bj from a hot chick...she freakin choked on my penis! It was nasty!"
"Sounds to me like you got it on with a Throat Clobber'er. "