Green’s Dictionary of Slang

man alive n.

also dead alive

[rhy. sl.]

(bingo) the number five.

1981		P. Wright Cockney Dialect and Sl. 109: 5 = Jack alive, dead alive.
1992		R. Puxley Cockney Rabbit.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.