Green’s Dictionary of Slang

1. in pl., the testicles [play on stone n.¹ (1)].

c.1620		Fletcher Women Pleased III iv: ’Twere better far you had lost your paire of pibbles [sic], Then she the least adornment of that sweetnesse.
c.1800		‘The Reels o’ Bogie’ in Burns Merry Muses of Caledonia (1965) 154: His pebbles they went thump, thump, / Against my little wanton rump.

2. (orig. boxing, then Aus.) anyone seen as hard to deal with, e.g. a youthful ruffian.

1843		W.T. Moncrieff Scamps of London III i: Now, my pebbles, I’ll give you a toast.
1848		Port Phillip Herald (Melbourne) 29 June 2/4: A carpenter [...] having been observed by three ‘pebbles’, who were watching him outside, they followed him till he got opposite the Church, when they attacked and attempted to rob him.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor III 387/2: ‘He was a pebble;’ that is, I never once said, ‘Oh!’ or gave out any expression of the pain I suffered. I took my flogging like a stone.
1874		M. Clarke Term of His Natural Life (1897) 407: You’re not such a pebble as folks seemed to think.
1890		‘Rolf Boldrewood’ Colonial Reformer I 80: He was a regular pebble.
1901		W.S. Walker In the Blood 157: ’E’s been in quod twenty times since. ’E’s a pebble, ’e is!
1906		E. Dyson Fact’ry ’Ands 128: S’elp me shicker, Twenty, you was the on’y pebble.
1915		Bulletin (Sydney) 5 Aug. 47/2: ‘I thort you wus my fair dinkum tart, an’ ther chanst o’ ther other pebble wus Buckley’s’, says I. [...] ‘I always thort you a square piece.’.

3. a monocle.

1898

Binstead & Wells Pink ’Un and Pelican 193: He screwed a pebble into his eye, and surveyed things.

4. (drugs, also peb) a small piece of crack cocaine [play on rock n. (5d)].

1989		(con. 1982–6) T. Williams Cocaine Kids (1990) 42: Look carefully at these pebbles.
1992		T. Williams Crackhouse 79: She picks up her pipe, reaches into her blouse, retrieves a small hidden pebble, places it into the glass-bowl end of the pipe, lights up, pulls as long as she can.
2003		J. Lethem Fortress of Solitude 383: He showed me what was a rock and what was a pebble and a twig. He and I smoked a few of these.
2015		410 ‘Four Door Coming’ 🎵 Got the food right like Timmy Hutton / Put it in pebbs then it’s running.
2018-20		T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 Pebs, pebbles - pellets or deals of heroin, crack or steroids.