Prom Swinging

The act of two upperclassmen who are going to prom together double dating with an underclassmen couple so the underclassmen can go to prom together. Typically in this situation the upperclass girl writes the underclass guy off and the upperclass guy writes of the underclass girl. They still dance with their boyfriend/girlfriend through the duration of the dance.

bob: are you going to prom?
fred: yeah were prom swinging w/ my upperclassmen bro.