down-stroker
A down-stroker is a kind of hand-job - the opposite of a pull-off, where a guy lubes his dick well and then, using alternating hands, grasps his cock near his cock-head and pulls and strokes his dick using only downward movements - NO UPWARD STROKES - until he has a down-stroke-gasm and shoots his load.
Now and then, Matt gives me a down-stroker -- I always end up tasting my own cum!