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1.
The act of opening a soft drink can's top
There is nothing a refreshing as the sound of Coca-Cola splitop.
by Softdrinker June 23, 2011
 
2.
A program where soldiers split their Basic Training and Advanced Training in half - resulting in Advanced Training being typically completed the following year.

Split Op recruits are renown for hanging out with Recruiters and tend to be ate-up upon completion of their Advanced Training.
That Split Op soldier sure is a pussy.
by Dave Gattler June 19, 2006