Green’s Dictionary of Slang

dicksucking n.

fellatio.

1976		D. Galloway Melody Jones 51: Sammy’s long since left his wife for the old dick-suckin’ trail [Simes:DLSS].
1985		‘J. Dagion’ Trash 72: Jerry had his dick-sucking technique totally perfected [Simes:DLSS].
1995		Handjobs (CA) Mar. 29: I learned to jack my dick and his, and to appreciate dick-sucking [Simes:DLSS].
1999		Bill Drake ‘SEC Spring Break’ Pt 4 on Nifty Erotic Stories Archive 🌐 After alternating between the two big Gator dicks, Peyton’s cocksucking mouth began taking both heads in at once. The two guys were getting really worked up by Manning’s hot dicksucking abilities.