Base Zero

The step even before first base, holding a someones hand.

Forget first base, I haven't even reached base zero with Sarah!

by Anonymouz Bob September 12, 2010

Base Delta Zero

The complete and total bombardment of a planetary surface, eradicating all life in the area with such force as to leave said area uninhabitable for a long period of time afterwards. In a large scale assault, may also involve burning away of the atmosphere. Usually the assault is performed by an Imperial-Class Star Destroyer or an equivalent type cruiser.

"Commander, prepare to execute the Base Delta Zero strike on San Francisco"
-Admiral Kanos

by Sax Russel March 27, 2004

Zeroth base

Anything less hardcore than kissing.
For example handholding

"dude I can't believe I went to zeroth base with my crush today!"

by oingyboingy September 22, 2025