(slang, vulgar) Indicates disapproval, contradiction or disbelief.

(chiefly US, somewhat dated and rustic) An expression of surprise or dismay.

(obsolete or archaic) I swear.

his nibs in the first person

Refers to the person one is addressing, when giving caution or advice, indicating that the person is inferior in some way. It does not necessarily refer to a relationship.

(slang, vulgar) Indicates disapproval, disagreement, or disbelief, often with a tone of disregard, disdain, or disgust, referring to the buttocks.

(slang, vulgar) I; me; myself; oneself in the third person.

A common way to identify oneself.

(colloquial, idiomatic) My fault; mea culpa.

(idiomatic) Indicates disapproval, disregard, disdain, disgust or disbelief. / Used other than figuratively or idiomatically: see my, foot.