to grab something in greed, esp. without permission
1965-70; perh. blend of snack + scarf
"to take, grab," by 1989. Related: Snarfed; snarfing.
To hurry; go faster; make it snappy: Get that floor clean and snap to it (1967+)
To become sharply attentive and responsive: His soldiers snapped to and did what they were told
[1940s+; fr the quick way a military person snaps to attention on command]