The story
From imaginary + lat (“(slang) latissimus dorsi muscle”) + syndrome.
Etymology from Wiktionary, CC BY-SA 4.0.
imaginary lat syndrome
im·a·gin·a·ry lat syn·dromeToday it means: A tendency for one to adopt a posture as if one had larger latissimus dorsi muscles than one actually has, especially a posture where the arms are held away from the torso. Full definition →