| Show Slang |
| Bag & Tag: Term for collecting evidence. Evidence is collected, placed in appropriate sized containers, annotated, & then sealed to preserve the chain of custody. |
| Bolo: Be On the Look Out |
| Head: Navy term for a lavatory. Other services refer to it as a 'latrine'. |
| Ladder: Navy term for a passage on a ship that provides for vertical access to another deck. Can be an actual ladder, but also refers to a staircase. |
| LEO: Law Enforcement Officer |
| MTAC: Multiple Threat Alert Center |
| NWTD: Non- Water Tight Door. Can be seen painted on doors located aboard vessels. Contrast with WTD. |
| On your six: right behind you |
| Probie: The expression "probie" is the most frequently said word on the show being slang for "probationary". Usually, it is said by Tony as a refference to Tim, stating that Tony is a more experienced agent. But other people have been called probie, including Gibbs himself. |
| Screw: Navy term for the propeller-like objects that propel a vessel through the water. |
| Scuttlebut: Navy term for water cooler talk or gossip |
| WTD: Water Tight Door. Can be seen painted on doors located aboard vessels. Contrast with NWTD. |