speedy Gonzales, n. — Green’s Dictionary of Slang

speedy Gonzales n.

[the old joke about Speedy Gonzales, a quick and eager fornicator, plus Warner brpos. cartoon seriesfeaturing a fast-running Mexican mouse, laucnhed 1953]

(US) a person who moves, works or operates very fast; as adj., quick.

1956		‘Ed McBain’ Cop Hater 7: ‘If it ain't Speedy Gonzales and Whirlaway," the second Homicide cop said. "You guys certainly move fast, all right. What do you do on a bomb scare?’.
1965		W. King Jr. ‘The Game’ in Kochman Rappin’ and Stylin’ Out (1972) 391: The stud is a maniac for broads, doesn’t matter if they are fat, ugly, skinny; let them come, Mac’ll make them quicker than Speedy Gonzales.
1977		(con. 1950) J. Rosenthal Spend, Spend, Spend Scene 4: Aye, aye, it’s landed! Speedy Gonzales.
1996		Eble Campus Sl. Sept. 6: speedy gonzales – quick [...] ‘Let’s be speedy gonzales this morning.’.