"affected with cramps," late 14c., from cramp (n.1) + -y (2). Related: Crampiness.
Entries linking to crampy
cramp n.1
"involuntary and painful muscle contraction," late 14c., from Old French crampe (13c.), from a Frankish or other Germanic word (compare Old High German krapmhe "cramp, spasm," related to kramph "bent, crooked"), from Proto-Germanic *kramp-, forming many words for "bent, crooked," including, via French, crampon.
Writer's cramp is first attested 1842 as the name of a physical affliction of the hand, in discussions of translations of German medical papers (Stromeyer); also known as scrivener's palsy.
-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.