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1.
One who is fearless; a pimp or player; a person who is dangerous in physical combat, a fighter.
"That guy just beat all 3 of us up at once! He is a real Rader.
by Omenfortuna December 16, 2008
 
2.
Anal Inserter. Person giveing Anal sex.
Monica later found out that Matt was the Rader.
by Josh Parker February 29, 2004
 
3.
about to get some hot lovin but too scared to initiate.
dont be such a rader and hit it!
by jhfyj March 25, 2005
 
4.
a noun used to describe someone creepy or odd, in reference to dennis rader, BTK.
dude this guy was walking around our neighborhood staring in people's windows, he is such a rader.
by jess and chris May 09, 2005