Green’s Dictionary of Slang

(S. Afr. gay) to practise intercrural or interfemoral intercourse.

1987

in M. Krause Invisble Ghetto (1993) 58: [T]he boy would never make the mistake of ‘breathing out’ into the hubby. It was taboo. Only the hubby could ‘breathe out’ into the boy’s legs! If the boy tried to ‘breathe out’, he would face a charge [Simes:DLSS].