Green’s Dictionary of Slang

1. to fool, to get the better of.

1833		H. Smith Gale Middleton 1 148: Why Jem, you buffer [...] you floored him in prime twig, and have faked him out and out with a single flip of your fib.
1885		‘’Arry on the Merry Month of May’ in Punch 16 May 229/1: Nature’s a fraud and a fizzle, that is if yer can’t fake her out / With the taste of a Man about Town, ony sort as knows wot he’s about.
1949		F. Leahy Notre Dame Football 69: If they are faked out they are lost temporarily [HDAS].
1956		‘More USAF Sl.’ AS XXXI:3 228: faked out, part. adj. Someone who gets into the traffic pattern before you, or taxies out in front of you, has ‘faked you out’ or ‘beaten you to the draw.’.
1967		E. Shepard Doom Pussy 142: We had been faked out before, and took it with a grain of salt.
1974		D. Goines Daddy Cool (1997) 13: The problem lay with faking out the two elderly women who worked in the storefront with him.
1985		J. Wambaugh Secrets of Harry Bright (1986) 169: About the time that Sidney Blackpool and Otto Stringer were in the desert getting faked out of their loafers by a foxy owl.
1996		S. Frank Get Shorty [film script] Whatta you mean, he faked them out?
2001		N. Green Shooting Dr. Jack (2002) 53: The other kid faked him out, scored on him.
2010		C. Hiaasen Star Island (2011) 26: That girl you shot at the hotel this morning it wasn’t Cherry [...] They toally faked out your fat ass.

2. to sneak away.

1957

P. Moore Chocolates for Breakfast 109: Sorry we faked out [...] You drank us under the table.

3. (US campus) to cheat on an exam.

1967–8

Baker et al. CUSS 114: Fake out Cheat on an exam.