Top definition
1. someone who fails to let people merge onto the expressway safely or fails to properly merge themselves.

2. someone on a road where two lanes merge into one, who speeds up to not let the car ahead of them in from the other lane, or speeds up from the right lane to cut in front of the cars traveling at safe distances apart in the left lane.

3. masturbating while merging onto the expressway.
Look at these people, not letting me over. Bunch of merjerks!!

Wow, look at this merjerk coming from behind to cut me off. He'd rather drive me off the road than have me in front of him....unbelievable.

Whew! I love a good merjerk... really eases the stress of driving around town.
by infiniti March 19, 2009
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