From the "Urban Dictonary" :

1. dickwad
   
George W. Bush
George W. Bush is a dickwad.


2. dickwad

Also known as a wad-of-dick.

3. dickwad

More powerfully insulting than its predecessor 'dickhead'

girl 1 - did that guy ever call?
girl 2 - no, what a dickwad!


4. dickwad

The tissue (kleenex) used to catch and mop up the ejaculate after masturbating. The tissue is then wadded into a ball and disposed of.
Popular australian usage amongst teens


5. dickwad

Your basic insult, vague but still mean. Used to insult males usually. Someone who doesn't disserve your time
jerk, asshole, moron, stupid

Insulter: Wow, you're dumb
Insultie: Shutup Dickwad!