mat play; sexual activity on an air mattress with lotion
Wasei-eigo term for a specific sexual service in brothels, involving body lotion and an air mattress. Not a general term for playing on a mat.
wasei-eigo (Japanese-coined English), from mat play
At that soapland, mat play is a popular service.
Mat play refers to a sexual act using lotion and an air mattress.
Wasei-eigo from English 'mat' and 'play', referring to a specific sexual service in Japanese brothels.