Meaning of SLAG in English

I. ˈslag noun

Etymology: Middle Low German slagge

Date: 1552

: the dross or scoria of a metal

II. noun

Etymology: earlier argot slag coward, worthless person

Date: circa 1958

slang chiefly British : a lewd or promiscuous woman

III. transitive verb

( slagged ; slag·ging )

Etymology: probably from slag (II)

Date: 1971

chiefly British : to criticize harshly

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.