Glasgow Patter: casting doubts on a person's sanity
bampot
An idiot, fool, or sometimes a nutcase. This is often shortened to bam, and any eccentric named Thomas risks being dubbed "Tam the Bam".
heidbanger
Sometimes shortened to header, this is a popular term for someone considered crazy, especially if dangerous. I assume it derives from the idea of a violent lunatic banging his head on a wall. This usage predates the contemporary alternative meaning of a heavy-metal enthusiast.
doobie
A fool or idiot.

©Michael Munro

Always in evidence in gutsy urban dialect, terms of abuse hinting at mental deficiency are numerous in The Patter, from terms almost of endearment to terms reserved for those thought to be severely deranged...