When the opponents open 1NT, a 2NT overcall is an artifical bid, which most players use to show a 2-suited hand. With a super strong balanced hand, you would simply make a penalty double rather than overcall 2NT.

To "overcall" is to bid directly over the opponents' opening bid. The term doesn't apply if the opponents have passed.

To "overcall" is to bid directly over the opponents' opening bid. The term doesn't apply if the opponents have passed.

call your boyfriend but DONT overcall. youll be overly annoying. so call your boyfriend just DONT overcall

Absolutely! The standard meaning of a double is penalty, and is usually based on having an equivalent (or better) hand than the NT bidder. Some partnerships use double to mean something conventional; a single suited overcall, or a hand with both majors, for example.