Something that is very old (many years have past). As balls are wrinkly (like old people), it makes a good analogy. Alternately from the facts that the 'ball', a spherical object, has been around for pretty much ages.
"Hey, did you see some of those artefacts in the museum?"
"Yeah man, they old as balls!"
by Hobbeh November 27, 2013
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Balls that are combined into one
My taint was fucked by old man balls
by KML19 April 2, 2017
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Old man balls are when older men's junk becomes one large grapefruit sized, saggy ball. There is no longer the ability to notice two balls, except one large sagging nut.
Example: did you see those old man balls on that guy? Looked like he was sitting with a grapefruit in his pants

Example: while having sex my taint was slapped by his old man balls
by KML19 April 3, 2017
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Someone who is suffering from aging of the testicles or epidermis surrounding his "junk"
The doctor knew from looking at the man's Old Sagging Balls (OSB) that he was easily 85.
by junk in de trunk February 26, 2010
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noun: droopy, wrinkled, testicles that belong to a man 45 years or older. Just the thought of old man balls (more commonly referred to as O.M.B.) is enough to make you shudder with disgust.

Girl 1: "So, how is Paul in bed?"

Girl 2: "Oh man, he was turning me on and all, but then I saw his Old Man Balls (O.M.B.), and I would have needed to do some meth to get on that!"
by O.M.B. February 19, 2009
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an old man that is so old he looks like a crusty old shriveled muffin with oldman clothes on it and youjust want to yell at him bcause he keeps talking about the new sex shop that just opened up but he cant hear you anyways because he forgot to put his hearing aid in cause hes stupid and cenile and needs to go to a home but his family cant afford it and you wish a dog would just attack him and put him out of his useless decrepid old man misery cause he hits on your freinds and its creepy cause hes dirty and old and needs alot of help. this is a greasy old grandpa balls
that greasy old man that is walking around but shouldent be walking around cause hes too old.
your grandfather!
greasy old grandpa balls are dirty and old!
by daner777 February 17, 2011
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One who is still young in age but exhibits extreme geriatric behavior. A person labeled "old balls" will often become exhausted after 9:00PM and kill the fratmosphere. S/he can be seen taking naps at all hours of the day adding to their crankiness.
"J.G. did not want to go out to the bars again tonight, he is being old balls".
by Boo-radley May 31, 2008
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