Green’s Dictionary of Slang

1. something useless, unnecessary, annoying (popularly defined as ‘ten pounds of shit in a five-pound bag’).

1959		W. Pearson Fever in the Blood 185: ‘Come on, Phil, give. What was the speech really like?’ ‘Well, Governor, speaking just citizen to citizen, it reminded me somewhat of a blivit.’.
1967		Current Sl. II:2 6: Blivit, n. An extremely unpleasant situation. (2 ½ pounds of crud in a one pound can).
1984		Elting & Cragg Dict. of Soldier Talk 29: ‘If he doesn’t cut it out, I’m going to hit him with a blivit.’ ‘What’s a blivit?’ ‘Ten pounds of shit in a five pound bag.’.
[2013		T. Robinson Hard Bounce [ebook] [I] had bags under my eyes that looked like five pounds of shit stuffed into a two-pound sack].

2. a fat or unpleasant person or thing; also attrib.

1945		H.B. Darrach Jr. ‘Sticktown Nocturne’ in Baltimore Sun (MD) 12 Aug. A-1/6: ‘Why, you tomato-face little blivit’ [...] Blivit Two quarts of whiskey in a half-pint bottle.
1949		R. Mende Spit and the Stars 109: He’s a beautiful blivit. And a blivit is — ten pounds of shit in a five pound bag.
1978		Fisher & Rubin Special Teachers 23: Blimpie didn’t add p to quit the blivet his nickname implied [HDAS].
1981		(con. 1966) P. Conroy Lords of Discipline 228: Every fat blivet I’ve ever met told me he had bad glands. Not one ever told me about stuffing too much chow into their fat blivet faces.

3. a distasteful or impossible job or situation.

1967		(con. c.1952) W. Crawford Gresham’s War 181: Even our junior officers wondered aloud just what it was that Mar/Div did this time to anger EUSAK so much to hand us this blivit [HDAS].
1972		Dahlskog Dict. Contemp. and Colloq. Usage.
1986		G.V. Higgins Imposters 339: And you’re not going to leave the two of us with a blivit to juggle .
2006		‘Yogi’s Restaurant spawns a blivet’ at www.ntoctalks.com 21 Mar. 🌐 Drivers end up with a blivet. Trying to get 1,800 or more vehicles per hour on a lane that will accept only 1,600 vehicles per hour. [...] Blivet is defined as trying to fit 8 pounds of stuff in a 5 pound bag. A reverse blivet is trying to fill a 5 pound bag with 3 pounds of stuff.