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Old English slim "slime," from Proto-Germanic *slimaz (cf. Old Norse slim, Old Frisian slym, Dutch slijm "slime, phlegm," German Schleim "slime"), probably related to Old English lim "birdlime; sticky substance," from PIE root *(s)lei- "slimy, sticky, slippery" (cf. Sanskrit linati "sticks, stays, adheres to; slips into, disappears;" Russian slimak "snail;" Old Church Slavonic slina "spittle;" Old Irish sligim "to smear," leinam "I follow," literally "I stick to;" Welsh llyfn "smooth;" Greek leimax "snail," limne "marsh, pool, lake," alinein "to anoint, besmear;" Latin limus "slime, mud, mire," linere "to daub, besmear, rub out, erase"). As an insult to a person from mid-15c. Slime-mold is from 1880.
"to cover with slime," 1620s, from slime (n.). Related: Slimed; sliming.
A despicable person; a repugnant wretch; geek, scumbag, sleazebag: I'm a disgusting slime bag, but I don't grovel/ I remember when the slime-balls used to be packed in there so solid/ If you chill out, those low-life slime buckets will sew your fingers inside your mouth (1970s+)
(Gen. 11:3; LXX., "asphalt;" R.V. marg., "bitumen"). The vale of Siddim was full of slime pits (14:10). Jochebed daubed the "ark of bulrushes" with slime (Ex. 2:3). (See PITCH.)