randy (adj.)youdaoicibaDictYouDict[randy 词源字典]
1690s, Scottish, "aggressive, boisterous," probably from rand "to rave," an obsolete variant of rant (v.). In the original sense especially of beggars, "and probably implying vagrant habits as well as rude behavior" [OED]. Sense of "lewd, lustful" first recorded 1847. Related: Randiness.[randy etymology, randy origin, 英语词源]