A common sport among prisoners when an inmate unwraps a Jolly Rancher and places it between his/her butt cheeks. Later that day, they remove the Jolly Rancher, re-wrap it, and set it on an empty table. They then move a few paces away and wait for an unsuspecting "fish" to "take the bait" and eat the butt-Rancher.
We were prison fishing for hours last week. The only downside is that my bum is still sticky.
by eaglefeather44 March 15, 2009
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A derogatory term given to new prison inmates. Much like the opening and closing of a goldfish’s mouth, new inmates are expected to make a similar face for their cell mates.
We got a new Prison Fish, boys!”

Show me that pretty mouth of yours, Prison Fish!”
by Knows-too-much March 25, 2023
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