Septic (an American. Rhyming slang - septic tank - yank)
Radgie - mad. Has issues. Usually violent
Micey - nuts
Heed the baw (Scottish - nutter. Lit: Head the ball)
Sky - Pocket (sky rocket)
"Its a bit George in here" (George Michael - Wham - warm)
"Theres just no Russel Grant with you" (Happy medium)