in one’s stomach, esp. of drink.
|Old Sailor’s Yarns 68: Old Cuff, who was ashore on liberty [...] had his ‘beer aboard’.‘Old Cuff’|
|Forty-Niner (1920) 47: Some of the men got too much gin aboard and a quarrel started.|
|‘Roll Up at Talbragar’ in Roderick (1972) 746: A new-chum suggested that Jack had more than he thought aboard and was thrown from his horse.|
to be drunk, to get drunk.
|Song Smith 71: He wou’d now and then get so aboard of the grog!|