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1.
a sufficient amount of liquor to cause intoxication.
I saw my neighbor at the bar last night, he had a snootful.
by Sarah Mystery December 03, 2007
 
2.
A snootful refers to an excess of anything inhaled through the nostrils. I believe that "snot" is related to "snoot."
Aye, methinks that ye had a snootful last night, laddie !!!
by Johnny Chingas March 23, 2005