- (in compounds and phrases) relating to copulationThe common association of beds and copulating, in such phrases as mattress drill and beating the mattress. Mattress extortion is sexual blackmail or persuasion:So you con him into moving to sunny Florida. Maybe a little mattress extortion there. (Sanders, 1982)
How not to say what you mean: A dictionary of euphemisms. R. W. Holder. 2014.