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To adopt a word or phrase into your vocabulary that is frequently used by someone you know
If you keep saying that all the time, I'm going to sponge it.

Was it you that I sponged "big oof" from?
Sponge by CrimsonBlader24 November 17, 2020
When someone does not have an opinion of their own, and just gobbles up information without critical thought.
Valentina is such a sponge, she just believes everything she hears.
Sponge by Gregor the amazing warlord November 25, 2020
That guy laying in a pool of his own piss is a sponge.
sponge by Nmugsy January 31, 2004
Usually meant to describe a guy or girl that's your rebound after a breakup. They soak up all the bad/bitter/angry memories of your ex, while still allowing you free reign to continue to see/date/fuck anyone you do so please, all in an efficient effort to help you heal and get over your ex.
"Yeah that girl, she's cool and all, but she's just my sponge."
sponge by Diablo October 9, 2005