number two

(euphemistic, usually childish) Feces; the act of defecation.

(nautical, slang) A first mate.

A primary assistant; vice-leader.

(cricket) The batsman who opens alongside the number one, but does not face the first delivery.

(theater) A somewhat small town, between a number one and a number three, where the success of a theatrical performance is unlikely to be very great.

(Philippines) mistress (the other woman in an extramarital relationship, generally including sexual relations)