milkweed: annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads
sow thistle: any of several Old World coarse prickly-leaved shrubs and subshrubs having milky juice and yellow flowers; widely naturalized; often noxious weeds in cultivated soil
disco: popular dance music (especially in the late 1970s); melodic with a regular bass beat; intended mainly for dancing at discotheques