O

odour colon - a pun on 'eau de cologne'. "Sorry about the smell, it's my odour colon".

offie - very common term for an off-licence (where they sell alcohol). e.g. "D'you fancy popping dahn the offie for some booze ?".

(do the) off /frank - to leave, "I'm gonna do the off". To 'do the Frank' is Modern Rhyming Slang for Frank Bough (off), "I'm gonna do the Frank".

off your face - to be very drunk. e.g.. "Last night I was totally off my face !".

off your trolley / rocker - a bit mad, crazy.

oily (rag) - Rhyming Slang for 'fag' (cigarette).

old boy / old chap - the term 'old boy' can be used for an old man, i.e. "Look at that poor old boy over there", or can be used as a euphemism for the penis.

old fruit - an affectionate address. Of unknown origin. e.g. "Awright me old fruit, how's it going ?".

one-eye(d) - the hole at end of penis. Also, 'one-eyed' is used as a prefix to many phrases for the penis, i.e. one-eyed trouser snake etc.

on the game - to be prostitute.

on the job - to be involved in sexual activity. i.e. "John's got a smile on 'is face, must 'av been on the job all night".

on your bike ! - an common exclamation for 'go away' or 'you must be joking'.