Green’s Dictionary of Slang

1. all over, completely.

1838		Crim.-Con. Gaz. 20 Oct. 70/3: Him observe dat ‘what shocking bad hat’ gib way to ‘flare up’ and ‘all around him way’ make way for ‘who am you’.
1843		R.S. Surtees Handley Cross (1854) 427: ‘ll round my ’at!’ squeaked Benjamin in the crowd.
c.1865		‘The Ballad Mongers’ in Fred Shaw’s Champion Comic Melodist 52: ‘All around your hat,’ Sirs.
1878		‘’Arry on Pooty Women’ in Punch 21 Sept. in P. Marks (2006) 149: I’m a ’ot ’un mate, all round my ’at.
1882		‘’Arry on a Jury’ in Punch 15 Apr. 177/1: And, thinks I, this will be ‘tuppence coloured,’ and spicey as all round my hat.
1892		‘’Arry in Venice’ in Punch 27 May 88/3: That fairy-like Carnival Bally, fetched Polly, ah, all round ’er ’at!

2. in fig. use, implying carelessness.

1836		Berks. Chron. 30 July 4/5: A squat, bow-legged figure [...] exhibiting in his whol appearance an ugly specimen of the ‘All-round-my-hat’ fraternity.
1846		Censor (London) 18 Jan. 3/3: [T]hat most comical of bag-men ‘all around my hat’ Hansel, who gave a gipsey woman into custody for asking him the time, believing [...] that she had a design upon his gold watch.