Someone you can barely understand when they are stoned, or someone who tries to speak a different language when stoned.

Side effect of spending too much time using your Rosetta Stone software.
Symptoms are similar to that of smoking a generous amount of high quality marijuana.

Feeling that you "really know" a language; often caused by excessive, regular use of the Rosetta Stone Software. Common side effects include: strong sense of euphoria; spinal problems due to nose constantly in air; severe lingual confusion; and loss/gain of friends (outcome may depend on social class).

When your friend gets so high he/she passes out that you write hieroglyphs on their face.

A big stone with three languages that let us understand the other languages:
These languages were probably:
English
Ghetto
Ratchet

1: Being so high that you begin speaking another language.

2: A song by the Progressive/Psychedelic Metal band "Tool."

Trying to learn another language after you just smoked copious amounts of marijuana.