Well, it means for the time being (for the nonce). But it's only used like that within that phrase.
Mostly, if you hear someone use the word nonce it means sex offender.
[eta] according to wikipedia:
Quote:
Nonce may refer to:
*Cryptographic nonce a number or bit string used only once, in security engineering
*Nonce (slang), a British and Australian slang term for a sex offender, usually a sexual abuser of children
*Nonce, time being: the present occasion; "for the nonce"
*Nonce word, a word used to meet a need that is not expected to recur
*The Nonce, American rap duo
*Nonce orders, an architectural term
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That made me giggle. I doubt they have much of a British following, or at least not one that would wear the name on t-shirts :P