Navy slang for when three
men are having sex with a woman simultaneosly. Euphamism based on US Navy material condition of readiness which determines which fittings (doors, vents, etc.) are to be closed on a naval vessel. Condition Dog Zebra is the most secure condition, where all airtight, watertight, firetight, and fumetight fittings are secured.
So when three male sailors are teamin' a chick (whether a betty out on liberty, a female shipmate,
whatever) they
will "
set condition dog zebra" where one guy fucks her pussy, one guy fucks her
ass, and one guy is has his dick in her mouth, thus "all openings secured"
"We had some liberty in PI with this
fine as
ho so me and my boys set some dog zebra!"
or...
"How come all these chicks are gettin' pregnant out on WestPac? Too many
people settin' dog zebra on a bitch."