O

[odds and sods]  {n.}

Substitute for '[odds and ends]'. Miscellaneous items or articles, bits and pieces.

[off one's head (or out of one's head)]  {adj.}

Mad or delirious.

[off one's nut]  {adj.}

Crazy or foolish.

[off the hook]  {adj.}

Free from obligation or danger.

[oik]  {n.}

Someone of a low social standing (derogatory).

[old bill] or [the old bill]  {n.}

A policeman or the police collectively.

[on the piss]  {adj.}

Getting drunk, drinking alcohol.

[one's head off]  {adv.}

Loud or excessively. "I laughed my head off" or "She screamed her head off" for example.