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1.
A person who rows on a crew team and has made crew his or her life, blowing off school work or not hanging out with friends because they have practice or a race instead.
Hey man, you wanna hang out after school?
Sorry, I can't. I have crew practice.
Oh come on man. Don't be such a crewtard!
by Skullingisnotfornovice November 15, 2011
 
2.
A crewtard is a NASCAR crew chief that is so stupid, every mechanic on the team could do a better job.
"We run like a bag of trash every week because our crewtard thinks he is smarter than everyone else in the garage."
by Dennit Racing October 18, 2012