generally an old mans balls, hanging so low they skim the water surface of toilet bowl. If you're a sack skimmer=old man
I didn't realize my Uncle Joe was so old until I saw him pee, he's clearly a sack skimmer
A safety device that is used after spooging in hot-tub, pool, etc., and the spooger has the skimmer to get rid of the evidence prior to another using the water works.
Dan knew he was in trouble when he couldn’t locate a spooge skimmer.
Floating around in a blow up Walmart pool with a beer in one hand and a pool skimmer in the other.
I had such a shitty day at work, I had to go out and do some skimmer therapy for a while.