A sippy is a unlikeable person who never has their own things and always needs to borrow or take things from other people. They will also never do things for other people and only care about their best interests.
Hey, have you seen that new kid?

Yeah, he had to borrow my pencil and book today, he seems a bit of a SIPPY.
by thebigwan March 05, 2015
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milk producing breasts often referred to by breast feeding children
mom, her sippies are bigger than yours!
by love, unknown. October 12, 2009
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An amount of alcohol consumption that is definitely inadvisable and possibly life threatening.
"Hey man, you don't look so good, everything okay?"
"I've got a monstrous hangover, went out for a quiet drink last night but it ended up turning into sippies."
by Trains McAvanti July 24, 2021
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"I got some sippy last night!"
"after, on the ride home she game me sippy"
by TheMaz December 08, 2016
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when you and your friend are having drinks on the patio with a cup and a screw on lid and a straw that don't come out then you two r sippy cu's
hey sippy cu you coming over for a drink
by the best sippy cu July 16, 2012
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A unique yet conversation starting nickname for an uncircumcised penis
Circumcised male: Hey man, your penis looks like at anteater spout!

Uncircumcised male: Nah man, I call it a sippy cup how bout you sip on this ole b**** haha
by dollfacemonsterdelight March 22, 2021
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I was getting a rim job when the skeeze up and left, leaving me with a sippy cup.
by 709mning March 02, 2018
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