Green’s Dictionary of Slang

mollock v.

[? dial. marlock, to frolic, to gambol + rollick, coined by Stella Gibbons in Cold Comfort Farm (1932)]

to cavort, to have a good time, to have sexual intercourse.

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[UK]A. Sinclair Breaking of Bumbo (1961) 70: Hoo’s tha’ auld City wurrrld bin mollockin’ ye around the noo?