Definition

A drinking shortcut where you pour a small shot of liquor directly onto the bottle's cap and take it as a quick shooter. Efficient, improvised, and definitely a sign the party's picked up.

Example Usage

Tyler offered me a tap cap of whiskey, and I regretted it immediately.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=tap%20cap&defid=15018398)