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1.
When someones eyebrows are so big and bushy, they look like they could crawl off of the persons face.
"Oh my God, look at that guys caterpillar brows!"
by Mizz AB December 08, 2007
 
2.
An eyebrow with no gap in it, a unibrow , a retards facial feature, a sign of inbreeding,
Simon and Ryan still look like retarded monkeys even though they have shaved a gap in their caterpillar brows :-)
by Dwight Doolittle January 31, 2008