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1.
Someone who is slow and retarded.
That guy Gregg is a fucking Slowtard.
by Thimble October 20, 2003
 
2.
The person in the car ahead of you who is driving retardedly slow.
I would have been here earlier, but the slow-tard in front of me insisted on driving 15 mph the whole way.
by josh20mn February 23, 2011
 
3.
Someone who is very slow in the head, but is not quite a retard.
Wendy has blonde hair, she must be a slowtard.
by GoBananazz February 05, 2010