Green’s Dictionary of Slang

bob v.3

[SE bob (up and down)]

to act in a nervous manner; thus bobbing n .

[UK]G. Kersh They Die with Their Boots Clean 88: ‘What’s Bobbing?’ ‘Oh . . . sort of bobbing; getting nerves, worrying.’.
[US]Dinah Washington ‘Long John Blues’ 🎵 But I think I feel it bobbin’.

SE in slang uses

In phrases

bob and weave (v.) [boxing imagery]

to avoid direct action, either confrontation, explanation, aggression etc.

[UK]Guardian 3 Oct. 🌐 Saddam Hussein, as usual, is bobbing and weaving. We should call his bluff.
[US]R.A. Dickey Wherever I Wind Up 196: Mostly in that first meeting I bob and weave and give him inauthentic boilerplate and platitudes.
bob around (v.) [note Dict. Americanisms (1951): ‘The popularity, and possibly the origin of this expression may have been occasioned by a popular song “Bobbing Around” sung by Stephen C. Masseet, a minstrel, in California mining camps during the fifties’]

to move quickly from place to place.

[US]Carroll Free Press (Carrolton, OH) 22 Nov. 3/3: O Sam’s a funny boy, he goes / Bobbing around, around, around, / Loves his friends and lams his toes, / As he goes bobbing around .
[US] ‘Bobbing around!’ in Fred Shaw’s Champion Comic Melodist 19: The air is old, but the words are new, / For I’ve been bobbing around.
[US]J.R. Browne Adventures in Apache Country 182: She had prospected awhile in Australia, and bobbed around Frisco for the last few years.
[US]Schele De Vere Americanisms 585: Bob, to, around, to make frequent calls upon a number of friends, is probably as much English slang as American. ‘Bobbing around’ is, however, a favorite expression in the United States.
[US]Louisiana Democrat (Alexandria, LA) 23 Dec. 3/3: A man in Arkansas [who] was bobbing around in a lively manner ot organize a railroad company.
[UK]Hull Dly Mail 1 Sept. 3/2: ‘Bobbing around’ Hull we also came into contact with another fistic exponent, Billy Ellis.
[US]Day Book (Chicago) 21 Oct. 12/1: These boys we see nowadays are so busy bobbing around to keep from getting hit they never set.
bob on (v.) [SE bob v.; the image of a cork bobbing on choppy water]

(orig. milit.) to await anxiously.

[UK]‘J.H. Ross’ Mint (1955) 89: I’m bobbing on not getting that intelligent job from him!
[UK]Fraser & Gibbons Soldier and Sailor Words 29: BOBBING ON, anticipating or expecting something [...] with the sense of looking forward to something unpleasant.
bob up (v.)

to appear (unexpectedly).

[Aus]Bulletin (Sydney) 21 Mar. 6/2: Alderman ’Anley Barnett, of glorious Parliamentary memory, bobbed serenely up, and, with all the native modesty of former years, proposed himself as a fit and proper person to fill the first mayoral chair.
[US]Courier (Lincoln, NE) 17 Nov. 1/2: A vote would bob up for C.O. Whedon every once in a while.
[US]Ade Girl Proposition 82: Thus she threw them into the Scrap Heap as fast as they bobbed up.
[US]Day Book (Chicago) 31 May 26/2: Every once in a while Rev. James H. Gray would disappear, and somewhere in the West Virginia mountains James H. Graham would bob up.
[UK]‘Sapper’ Bulldog Drummond 198: He always bobs up somehow.
[US]D. Runyon ‘Breach of Promise’ in Runyon on Broadway (1954) 16: When I am in Mindy’s restaurant [...] who bobs up but Harry the Horse.
[UK]S. Jackson An Indiscreet Guide to Soho 63: If you spend any length of time in Soho, the same faces are apt to bob up.