Green’s Dictionary of Slang

lugs n.

(US) affected manners, posing, pride.

[US]D. Runyon ‘Breach of Promise’ Runyon on Broadway (1954) 28: You and I are just plain ordinary folks without any lugs.

In phrases

put on lugs (v.) (also pile on lugs)

(US) to put on airs, to act affectedly.

[US]K. Munroe Golden Days of ’49 188: If you notice me anyways snifty or piling on any lugs in this here camp, you just bump me down hard.
[US]Ade Artie (1963) 33: The family did n’t put on no such lugs in them days.
[US]T. Dreiser Sister Carrie 528: They put on a lot of lugs here, don’t they?
Dly Press (Newport News, VA) 29 Apr. 5/2: ‘You don’t have to put on lugs to make any big hit with me, you know’.
[US]S. Lewis Main Street (1921) 326: He talks so refined, and oh, the lugs he puts on—belted coat, and piqué collar.
(con. 1917) in Stanley Walker City Editor 283: An astonishing person, Northcliffe, to one who encounters him for the first time. Not because he is so delightfully friendly – particularly to the men and women of his own craft – nor because he is so unafffectedly democratic – he puts on no more lugs than a Tammany district leader – but rather because of the remarkable agility and versatility of his mind.