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1.
Someone that has a dry, wicked since of humour. Often misunderstood but for some absolutely hilarious.
That guy is a Hallett
by shjeeky December 26, 2012
 
2.
a gathering of objects and/or persons formed in a semi-formal row.

Origin: mid Texas slang
The halletts of jars on the window sill sparkled in the morning light.
by Motive-Alloy February 26, 2010
 
3.
An inbred boy, result of inbreeding
1) The boy is clearly a hallett
2) The hallett of a local family
by Mister Mistoffelees January 20, 2004