"viscous adhesive substance," early 13c., from Old French glu "glue, birdlime" (12c.), from Vulgar Latin *glutis or Late Latin glutem (nominative glus) "glue," from Latin gluten "glue, beeswax," from PIE *gleit- "to glue, paste" (source also of Lithuanian glitus "sticky," glitas "mucus;" Old English cliða "plaster"), from root *glei- "clay," also forming words with a sense of "to stick together" (see clay). Formerly also glew. In reference to glue from boiled animal hoofs and hides, c. 1400. Glue-sniffing attested from 1963.
-y 2
adjective suffix, "full of or characterized by," from Old English -ig, from Proto-Germanic *-iga- (source also of Dutch, Danish, German -ig, Gothic -egs), from PIE -(i)ko-, adjectival suffix, cognate with elements in Greek -ikos, Latin -icus (see -ic). Originally added to nouns in Old English; used from 13c. with verbs, and by 15c. even with other adjectives (for example crispy). Adjectives such as hugy, vasty are artificial words that exist for the sake of poetical metrics.