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2.
When old men sit on each others cocks like stacked chairs
my grandad got kicked out of the old folks home for having a git stack
by Rex Rider June 01, 2007
 
1.
An orgy involving elderly geriatric men, the primary position of sexual intercourse resembling that of a "stack", ie sitting on eachother piled up,linked by their penises in the person in front's rectum.
The old people's home was temporarily closed today after all of the male residents were found in the dining room having a git stack.
by Rob and Jen June 06, 2007