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2.
A term commonly used by pirates and pirate wannabes. Means cease and desist.
Arr, avast lest ye want yer captain te chop off ye balls!
by Mark November 29, 2004
 
1.
hold and desist
Avast ye scurvy scoundrels! (Will you vitamin C deficient gentlemen please stop what you are doing.)
by Anonymous August 01, 2003
 
3.
A free antivirus program that i use, developed by Czech computer technology that tends to update your virus database very often, and tell you about it pretty much daily and can get a little annoying, though it is a decent program that works and is free.
Avast! virus database has been updated!
by NoReward October 16, 2011
 
4.
Pirate for "Look at that ass!"
"Avast, Cap'n, thar blows a hearty wench!"
by Dr. Shibby February 02, 2010