Personally-insecure male (usually Caucasian) between ages 19 and 29 who over-gels the top front of his short stringy hair, wears MMA attire or "rapper" fasions, tries in vain to talk in street-lingo and has a very tight leash on his girlfriend who hates him (she's often too young). He typically displays his insecurity when a real man comes around by chirping like an irritating little parakeet.
The Peckerwood-Jackass is also a semi-stalker because he will even snoop around his girlfriend's workplace to make sure she's not being hit on by other guys, though he lacks enough heart to confront the other men, he'll just take it out on her when she gets home.
Dana wore too much damn gel in his short hair and always made it a point to escort his 18-year old girlfriend everywhere she went, even while she's walking her dog and stalking her at her job because he was afraid of other guys hitting on her. He's a Peckerwood-Jackass!