This is the 414th most frequent German word.
voll
"Full."
Here 'voll' is used to indicate that the glass is filled to its capacity.
Das Glas ist voll.
The glass is full.
In this usage, 'voll' is informally used to mean intoxicated or drunk.
Er war gestern Abend voll.
He was drunk last night.
Here, 'voll' is used colloquially as an intensifier meaning 'very' or 'really'.