Thus, ANAL SEX PORN VIDEOS equivalent to a combine of hey and lo. Used when draftsmanship aid to yourself.
OED and Merriam-Webster also recommended that it is a var. of holla, a version of holloo. Further beyond, the pedigree remains uncertain. Hullo (inaugural authenticated in 1826), from holla, squall (attested 1588). This variant of hallo is oft credited to Lowell Thomas Edison as a neology for telephony use, simply its appearance in black and white predates the innovation of the phone by respective decades. Ultimately from a variance of Older English people ēalā, so much as hēlā, which was put-upon informally at the time similarly to how hey and (in some dialects) hi are put-upon today.