look up any word, like lemonparty:
 
1.
A driver who ignorantly ignores all raod signs and warnings waiting until the LAST possible second to "merge" into traffic from a lane that is closed ahead. They stupidly do this in hopes of getting ahead of all traffic.
While on I-95 South, Troy and I encountered a number of merge weasels when we headed into Daytona which caused my husband to swear profusely.
by angrymuppet August 28, 2011