Definition of "bloo"

Another chap had got my jack-nife, and was amusin' hisself by slashin' holes in my bloo cotton umbreller, which two other Muskeeters had shoved up, and was a settin' under, engaged in tyin' my panterloon legs into hard nots.

1870, Various, Punchinello Vol. 1, No. 21, August 20, 1870‎

"'That's whatever!' assents this marshal gent, 'an' you can gamble a bloo stack that hangin' you is a bet we ain't none likely to overlook.

1902, Alfred Lewis, Wolfville Nights‎

The Consarvatives painted thurselves bloo, and the Radicals yaller, an' thay as danced the longest, the Roomans sent to Parlyment to rool the roost.

1918, J. Arthur Gibbs, A Cotswold Village‎

I stayed there sicks years; from sicks, that is to say, till my twelth year, during three years of witch I distinguished myself not a little in the musicle way, for I bloo the bellus of the church horgin, and very fine tunes we played too.

1838, William Makepeace Thackeray, Memoirs of Mr. Charles J. Yellowplush‎