Feelings of shame, embarrassment, confusion (about feelings and/or sexual orientation), or just plain freaking out by a straight man after having been too emotionally close, physically close, or sexual with another man, who may be straight,
bisexual, or
gay. Based on the concept of buyer's remorse.
Jim and John were both drunk, horny, and
lonely last night and fooled around with each other. Today John has a serious case of straight man's remorse.
Doug and
Bill were really drunk last night, and Doug was spilling his guts about his girlfriend, and how much he hates his father, and other stuff. Doug was crying and
Bill ended up hugging him for a while. Now Doug has straight man's remorse.