Green’s Dictionary of Slang

a derisive phr. to one who has ‘butted in’ to a private conversation, who asked you to make a comment?

1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 51: Chain, Who Pulled Your: Who asked you to interfere, to ‘chip in.’.
1944		P. Kendall Dict. Service Sl. n.p.: who pulled your chain? . . . courteous retort implying that the fellow is a monkey.
1953		J. Thompson Savage Night (1991) 79: Who pulled your chain, grandpa?
1970		E. Thompson Garden of Sand (1981) 319: Listen to that. Who pulled your chain, twirp.