Green’s Dictionary of Slang

(US campus) in comb. with a relevant n., the quantity of, the degree of, e.g. dork-factor, the number of fools; dog-factor, the number of ugly women.

1977		Eble Campus Sl. Fall 3: factor – abundance of the noun preceding it; book-factor, food-factor, noise-factor.
1989		P. Munro Sl. U. 76: The squeeze-factor in that game was awfully high / The skank-factor at the party was good.
1990		(con. c.1970) G. Hasford Phantom Blooper 37: ‘R.P.G.,’ I say – rocket-propelled grenade. Beaucoup pucker factor.