A woman, or man, who gives such good oral service that they will create a bend in the shaft of a penis.
1) Harold: So, how about this flick, huh?
Jake: Tell me about it, dude. That chick is such a rod bender, she gives head so damn good.
2) Steve: So, how was your date last night?
Josh: Oh my goodness, dude, he was such a rod bender. My dick's still hard.