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1.
Another name for an alcoholic beverage of any sort.
"You boys been doin' a little boozin', have ya? Been suckin' back on grandpa's ol' cough medicine?"
-PA state trooper on "Dumb and Dumber"
by Nick D May 19, 2004
 
2.
Referring to whiskey or some other strong alcoholic beverage
Dude I think Tim was sucking on grandpas cough medicine
by Misery321123 February 27, 2011
 
3.
1) Old man booze, such as Jack Daniels, Jim Beam, or any such corn whiskey or spirits.
2) Jizz, cum, spooge, spunk, man-cream, love juice, ball beverage, nut nectar, well you get the picture
1) I got grounded for a month for sneaking in the basement and drinking grandpa's cough medicine.
2) My girl had the flu, so when she was blowing me, I came in her throat and gave her some of grandpa's cough medicine, and the next morning she was fine.
by MOUND October 31, 2004