snarkaleptic 

A person who is naturally inclined to have fits of nasty, assholish behavior on a regular basis. Usually someone with severe constipation, anal retention and control freak issues. Friends never know when this person will snap and become snarky.

"He's a nice guy but he's a snarkaleptic".

snarkaleptic by Breath of fresh air July 18, 2016

Snarkileptic 

A person who suffers from {Snarkilepsy}-a {neurological} {disorder} marked by sudden, recurrent, and uncontrollable episodes of sharply critical, cutting, or snide commentary.

Mary, a lifelong snarkileptic, couldn't refrain from telling the alopecia sufferer, "nice haircut."

Snarkileptic by Jetta101 December 5, 2015

Snarkoleptic 

One whose snarkiness regularly manifests itself so naturally and fluidly that snarky comments could be delivered even from the depths of beta sleep.

Wow, Jefe is quite the snarkoleptic.

Snarkoleptic by Heywood Jablomi May 23, 2008

snarkalopticus 

One who has a very snarky attitude.

Allison is being a big snarkalopticus

snarkalopticus by Ffman January 1, 2014