A clamjamfry, in Scots dialect, is a crowd; a disorderly noisy bustling rabble. To clamjamfry a place is to fill it up with an unruly mob.
"Mr. Archie," said she, "I hope that I ken my place better. It would be a queer thing, I think, if I was to clamjamfry up your faither's house - that I should say it! - wi' a dirty, black-a-vised clan, no ane o' them it was worth while to mar soap upon but just mysel'! Na, they're all
damnifeed wi' the black Ellwalds. I have nae patience wi' black folk."
--- Robert Louis Stevenson, Weir of Hermiston