He naturally can't handle 750 ml of alcohol in his 900 ml stomach. forgetin' pusillanimous individual.
This is a stupid assertion.
First off, the stomach isn't 900ml. The stomach can contain at least one liter of fluid.
[1]Second, alcohol poisoning doesn't come from the percentage of the stomach filled with alcohol; it comes from the amount of alcohol in
blood. The absorption rate for a male of 140 pounds seems to be approximately .015% per drink per hour
[2], while the metabolic rate of alcohol is about .015% per hour irrelevant of the quantity of drinks.
[3] This is why if you drink about one drink per hour your BAC will not continue to rise. The OP did not mention how long it took him to drink that 750ml bottle of vodka, but assuming he was drinking 'quickly' he probably drank about 6 shots an hour (one per ten minutes on average) which would mean he took 17 shots (750ml)
[4] over 3 hours. So, to calculate BAC at a given hour you can use
an = ((6*n)-n)*0.015.
a1 = 0.075 which is above the legal limit. When he finished drinking, at
a3, his BAC was approx
0.225. According to
this chart of effects at each BAC level OP would be disoriented, have difficulty walking, possibly experience some vomiting, and possibly blackout. The threshold for alcohol poisoning is generally considered 0.3%, but that's a low threshold. The math points to OP having an unnaturally low tolerance for alcohol.
Edit: added citations for some of the factors.
Re-edit: formatting and grammar.