buyer's remorse noun2 •A feeling of anxiety or regret after making, or after promising to make, a purchase, especially a purchase encouraged by a high-pressure sales pitch.In your new service contract, read the fine print of the buyer's remorse clause. Some carriers, such as VoiceStream, give you only 72 hours to decide whether to keep their service. — 2002 •A feeling of regret after any kind of decision, for example voting for a certain party or consenting to sexual intercourse with someone.