Etymology
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jerk off (v.)

slang, "perform male masturbation," by 1896, from jerk (v.) denoting rapid pulling motion + off (adv.). Compare come off "experience orgasm" (17c.). Farmer and Henley ("Slang and Its Analogues") also lists as synonyms jerk (one's) jelly and jerk (one's) juice. The noun jerk off or jerkoff as an emphatic form of jerk (n.2) is attested by 1968. As an adjective from 1957.

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pina colada (n.)

"long drink made with pineapple juice, rum, and coconut," 1923, from Spanish piña colada, literally "strained pineapple." The first word was originally "pine-cone" (and formerly pinna), from Latin pinea (see pineapple). Second word ultimately is from Latin colare "to strain" (see colander). Ayto ("Diner's Dictionary") writes that the drink probably originated in Puerto Rico and "enjoyed a certain vogue in the mid to late 1970s," as evidenced by a certain song.

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