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Green’s Dictionary of Slang

lunch v.²

[out to lunch adj.]

1. (US campus) to lack concentration, to be unaware.

1988

Eble Campus Sl. Oct.

2. (US black/teen) to act in a silly or irrational manner; to overreact; to procrastinate.

1997–2000		Da Bomb 🌐 18: Lunchin’ or Lunching: Messing up; not thinking straight; in nervous disorder; acting immaturely.
1998		(con. 1986) G. Pelecanos Sweet Forever 168: Damn, I must be lunchin’.
2000		Ebonics Primer at www.dolemite.com 🌐 lunch Definition: to go crazy or to talk much shit Example: Shaquanda came over here and she lunched the fuck out!

3. (US black) to go insane.

1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Lunch (verb) To go crazy.
1999		‘Master Pimp’ Pimp’s Rap 126: His wife had a massive heart attack while he was locked up. He lunched out (went insane).

In derivatives

lunching (adj.)

crazy, stupid.

1957		Wash. Post 29 Sept. F1/1–2: Of course, ‘lunching’ is the opposite of O.T.L. (out to lunch) which plainly tells you that someone is out-of-it, not-in-the-groove, or not-with-it.
1989		M. Belmonte Compter Science and Why (1993) 🌐 A common word overheard in the halls of the high school that I attended was ‘lunshin’ [ ...] ‘Lunshin’, as it was used, described a person who was temporarily being foolish.
1997–2001		Online Sl. Dict. 🌐 lunching adj 1. absent minded, inattentive. 2. stupid. Origin: probably a shortened version of the phrase ‘out to lunch’ which has a similar meaning. (‘Dude, you’re so lunching.’).