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1.
a] To act in a manner indicating that one's head is, in fact, a penis.

b] Used to describe a person who has six lovers on the side, while having a girlfriend.

c] Like horseradish, but made with dick instead of horse.
Your dickheadish head looks like my dick!
by Ben December 07, 2003
 
2.
An act done in haste where the postives are far outweighed by the negatives for the majority of those involved.
A Dickheadish Move
1 - "Where's My toothbrush?"
2- "I used it to comb my armpit hair"
1- "What a dickheadish move"
by Rex Candle September 09, 2005