Yaba

Yaba is a derivative of synthetic amphetamines such as speed and can be manufactured far more quickly and easily than traditional forms of amphetamine. Yaba is a recent phenomenon in the United States, although it has been popular in Southeast and East Asia for some time. Methamphetamine tablets are sent primarily by mail to northern California and the Los Angeles area, and although the demand for Yaba appears to be primarily in Asian communities, popularity is increasing among rave attendees.

Slang Terms: “crazy medicine,” Hitler's drug, Ice
It can be orally consumed and are sometimes candy flavored (grape, orange, and vanilla). “Chasing the Dragon” is another method of use. Users place tablet on aluminum foil and heat from underneath, as the tablet melts vapors rise and are inhaled. Yaba can also be snorted and injected.

It could be anything! Like "shut ur mouth u yabaface" Or u could just say it when ur bored

Yaba is an Acronym and means yet another bloody acronym.
It was uses in UseNet and IRC before a drug was named Yaba.
Today only very few people remember the original meaning.

In bulgarian (Яба) it's used for expressing surprise or admiration. It's not an official word from the dictionary but is known and used by everyone. If you do use it you will look like a villager to others.

you bastard

A Slang term that refers to methamphetamine and its use,

Some people also may use YABA in reference to snorting large amounts of cocaine but it is not as common

A wonderful anime