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1.
API
API = application programming interface

An API is a series of functions that programs can use to make the operating system do their dirty work. Using Windows APIs, for example, a program can open windows, files, and message boxes--as well as perform more complicated tasks--by passing a single instruction. Windows has several classes of APIs that deal with telephony, messaging, and other issues.
Windows uses an api called the Win32 API. You can access many command via the command prompt. Start >> Run >> Type in "command" or "cmd"
by Nathanmx May 26, 2004
 
2.
Api
A underground rapper that even does a few Nu-Metal songs about life, God, or exposing cops or other hypocrites for the cowards they are. Raps or sings about whatever the heck he wants to with a interesting way of talking.
Guy 1: "Yo, have you heard Api Berlitz on Youtube?"

Guy 2: "Fuh sho, kid's got talent. Hope he gets far."
by Rhonda_Lloyd September 12, 2013
 
3.
Skin cream made from beeswax
Feel the refreshing difference and use apis to sooth your nasty sunburn
by Jeff Bendfeld December 23, 2007
 
4.
API
Active pharmaceutical ingredient. The part of a drug that causes the effect.
The API of aspirine is acetylsalicylic acid.
by Wolfy_ July 23, 2010
 
5.
API
Adaptive Pie Interface. Used by various sites to interact with their pie servers. Urban Dictionary, for example, has created APIs so that developers with no pie servers of their own my serve pies to customers at low rates.
$urb = new Urban::API;
$urb->ServePie('me');
$urb->ThankYou();
$bill = $urn->I'llTakeTheBill;
try{
$bill->pay();
}or{
RUNAWAY();
}
by Tyler Menezes October 24, 2007