Green’s Dictionary of Slang

idling, loafing.

1865		Leaves from Diary of Celebrated Burglar 119/2: We had scarcely got seated when Shad Wade, the mooching ‘bludgeoner’, ‘pratting’ himself alongside of me and commenced ‘pumping’ me concerning the ‘burst’ at the hatter’s.
1919		E. Dyson ‘In Hospital’ in ‘Hello, Soldier!’ 22: In the moochin’ days of me giddy youth, / When I kidded meself a treat.
1935		(con. 1920s) J.T. Farrell Judgement Day in Studs Lonigan (1936) 466: Around the Greek’s poolroom, he had been a mooching clown.
1948		Heggen & Logan Mister Roberts I i: The two moochingest, no-good loud-mouths on the ship!
2012		(con. 1980s) I. Welsh Skagboys 387: Tell us how you can possibly hud out oan a moochin cunt whae’s nivir pit his hand in his poakit in the first fuckin place!