When the family or friends of a terminally ill person (sick, dying, or otherwise lame) throw a mattress over him/her and take turns wallowing on it in order to smother him/her.
"If Cousin Joe don't show no signs of recuv'ry, we's might just have to have ourselve's a right Mattress Party."
by Hillary Lauffer November 2, 2007
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When the family or friends of a terminally ill person (sick, dying, or otherwise lame) throw a mattress over him/her and take turns wallowing on it in order to smother him/her.

"If Cousin Joe don't show no signs of recuv'ry, we's might just have to have ourselve's a right Mattress Party."
by Hillary Lauffer December 9, 2007
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The sensation of having A Sex party horizontally on a mattress with your significant other.
Elizabeth: yo Tim did you hear Max and Lisa upstairs last night?"

Tim : Yeah I sure did I think they were having a horizontal horizontal mattress party "
by Kielbiski October 20, 2016
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A small Midwest political party lead by an anonymous individual operating under the pseudonym “Rambo”. The mattress party focuses on quality sleep and strong familial relationships. Their most popular advertising campaign parodied the popular “Make America Great Again” slogan and in combination with the popular internet meme “Netflix and chill” to create “Make Netflix and chill Great Again. Although an effective meme, MCCGA failed to promote the mattress party.
I supposed I’d describe myself as a moderate that really enjoys a good night’s sleep.

Oh, so you’re in the mattress party?
by MP Advocate May 14, 2022
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