trade-last

plural trade-lasts

1. USA compliment heard about another person, offered to be repeated to that person in exchange for another repeated compliment about the speaker.

   American adolescents regularly deal in "trade-lasts," compliments in exchange for another. They will tell you something flattering about yourself after you tell them a flattering remark you have heard about them.

   1979, Robert Kirk Mueller, Board Compass, page 102

   1 more example

   So autobiographical was The Children's Hour that there are even “TL's” between the children, those “trade lasts” in which people must come up with compliments they have heard about each other, a game which amused Lily […]

   1997, Joan Mellen, Hellman and Hammett, page 71

   Synonyms: TL