to make a sound resembling the grunt of a pig ...c1630 obs.
FIRST DOCUMENTED USE
c1630 - see EXAMPLE below
"...O, Viva! Viva! Gustavus we cry!
Heir we shall either won honour or dye.
Thow that riseth before the day dawning,
Mounted ere Phoebus saluteth the morne,
Yoffing, crying, youlling, yelling,
Lyk ane eitie swyne summonds out with an horne..."
From: Memoirs of a Cavalier
- Daniel Defoe