Mid 18th century: from Scottish Gaelic feileadh-beag ‘little kilt’, from feileadh ‘plaid’ and beag ‘little’.
“But what’s he got under his filibeg, that’s the question!”
Rampallion (noun) (rare) (archaic)
A ruffian, a villain, a rascal.
Late 16th century; earliest use found in Thomas Nashe (d. c1601), writer. Origin uncertain. Perhaps from ramp + -allion, perhaps showing alteration of rascallion by association with ramp. Perhaps compare later ramscallion, rapscallion, tatterdemalion.