Green’s Dictionary of Slang

1. to ignore a person deliberately, to snub.

1936		Ted Yates This Is New York 3 Apr. [synd. col.] The B’way columnmaniacs are raving about the gal [i.e. Josephine Baker] whom they ‘igged’ [...] when she first returned from abroad.
1941		‘Digg Mee’ ‘Observation Post’ in N.Y. Age 5 July 9/7: Now my business is to digg, but I’m never a ‘cat’ to ‘igg’.
1946		Mezzrow & Wolfe Really the Blues 18: For a long time the waiter igged us.
1959		A. Anderson ‘Blueplate Special’ in Lover Man 129: The chick iggs him completely.
1972		D. Claerbaut Black Jargon in White America 69: ig v. to ignore; disregard.
1979		‘Iceberg Slim’ Airtight Willie and Me 206: Rundown why you igged me.
1980		J.L. Gwaltney Drylongso 20: When they got wasted behind that, Sam just igged ’em.
1998		Source Nov. 202: Just because you may not have gotten a response does not mean that I’m iggin’ you.
2022		J. Hannaham Didn’t Nobody Give a Shit 168: Doodle, who'd cold igged her for a decade [etc].

2. to overlook something, to ignore the facts.

1938		Pittsburgh Courier (PA) 23 July 11/1: Leonard Harper’s present local review cut anyhing’s he’s done in many moons. It’s that smooth, and one that no thtergoer [...] can afford to igg.
1947		Time 10 Feb. 12: Until the groovy cats dig each other or a Webster happens by to help us pick up on what’s going down, Time will igg the issue.
1957		D. Burley N.Y. Amsterdam News 18 May 13: Letters are festers [sic, i.e. fetters], Dad, just like chains [...] you igg ’em while she has to dig ’em.
2000		P. Beatty Tuff 144: ‘When we sign our record contract, we going to be so big. [...] I can’t fuckin’ wait!’ ‘You iggin’, girl, we need to write some songs first.’.
2001		Saigon ‘Contraband’ 🎵 in Source Aug. 208: The fourth question’s a question that still ig me / Who do y’all niggas think that it was that killed Biggie?