In addition to the other definitions, a tranny chaser refers to the multitudes of creepy guys who stalk and/or lust over the Myspace profiles of transgendered individuals - including crossdressers.
Tranny Chasers often seem to:
"Straight" or "bisexual" as their status.
Married, or have children and a family, yet list themselves as "single".
In their 30s and 40s, or older.
Have nothing but transgendered people, crossdressers, or fetish clothing people, in their friends list.
Fat, or rather unattractive.
Claim that they are "accepting of other gender types" or that they seek a "relationship" with a t-girl. (in reality, they probably are just longing for sex with one)
Never talk to you, just add you, probably for the reason of seeing the other t-girls on the friends list, AND, most importantly, so he can have access to your pictures and jack off to them.
OR, on the rare occasions that they try to initiate conversation, they come off as nice guys, but its soon clear that they are just wanting to cyber
Speaking as a t-girl in her 20s, it's rather disconcerting to know that such perverts lusting after me.
F*ck tranny chasers. Seriously.