One whose socialpresence gives everyone around them an uncomfortable and painful feeling similar a dick in their ass.
"Man, Brian is such a dickass, he's rude and inconsiderate to everyone he knows. Having him around is about as bad as getting a dick in the ass. We shouldn't hang out with him anymore."
In Seattle of 1989, Metallica played the song "Whiplash". After Kirk Hammett's guitar solo, James Hetfield was originally supposed to yell "WHIPLASH!". However, he instead yelled "DICKRASH!" which blew up all over the internet
Adrenaline starts to flow, you're thrashing all around. Acting like a maniac; DICKRASH!