Drunk; intoxicated; "mow" being alcohol, resulting in phrases such as "on the mow" (drinking). Hence, "mowed"=drunk.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

Mowed, pronounced so it sounds like loud.
To devour, to eat a alrge quantity of food quickly.

the same meaning as pwned, but often used in computer games with large armies.

Under the influence of marijuana; high;

Originated in reference to grass; aka weed
"Mow" being weed. Hence, "on the mow, mowing" = smoking weed; "mowed"= high

To get told; often used in conjunction with the whole "arse is grass" thing.