mid-14c., lollen "to lounge idly, hang loosely," perhaps related to Middle Dutch lollen "to doze, mumble," or somehow imitative of rocking or swinging. Specifically of the tongue from 1610s. Related: Lolled; lolling. As a noun, from 1709. Grose ["Dictionary of the Vulgar Tongue," 1785] has lollpoop "A lazy, idle drone."