make the beast with two backs

make the beast with two backs

To engage in sexual intercourse with another person, referring to the exposure of each partner's back when embraced in the missionary or standing position. I have my suspicions that, in secret, they are making the beast with two backs.
See also: back, beast, make, two
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
See also: