"insignificant, trifling," 1550s, present-participle adjective from piddle (v.).
Entries linking to piddling
piddle v.
1540s, "to spend time with unimportant matters, to work in a trifling way," a word of uncertain origin, apparently a frequentative form. Meaning "to pick at one's food" is from 1610s; that of "urinate" is from 1796 as a childish word. Related: Piddled; piddler; piddling.