mate

This word has no translation into english, it's meaning being derived from the context of the situation it is used in, the length of time it is said, and the inflection in the users voice. It has meanings as diverse as "the guy you get pissed with on a saturday night" to "the guy you get pissed off at on a monday morning."

"'Sgoin on maaate?" "You dinged me car's what's goin on, mate..." "Aw maate... It was only a bit of paint taken off. Don't be so bloody pissy."