A US Navy wife who fucks around with other men while her man is out on deployment. Named for the West Pacific, or WestPac cruise, which is a common and lengthy deployment for West Coast sailors.
"Dude, don't fuck with those WestPac widows or you're liable to end up with a shotgun pointed at you."
by Mister Priapus June 2, 2005
A woman that is married to a Sailor who immediately gives up the pussy to another man as soon as her husband's ship leaves the pier.
As you're standing on the pier and you hear "Underway, shift colors" the Sailor is proud that he's serving his country and as soon as his ship is out of sight - his wife's panties instantly drop and she slips and falls on some stranger's dick. As this dude is banging this broad he's thinking - wow what a Westpac whore she is!
by Da R December 12, 2008