When you smile and your chin gets dents in it, like hamburger meat. Common in women over 40 and heavy set people.
You need some Botox in your chin to get rid of your hamburger chin.

Who are you, Chevy Chase with your hamburger chin?
by KissyLee November 17, 2021
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rcmx's nuts are on llama's chin
by rcmx October 1, 2018
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A word/phrase used whenever someone would like to sit on your/someone’s face in a sexual manner.
Wow,that lady has a very “sit-able chin”!!
by Nudey Novak May 31, 2022
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1. The act of titi-fucking a girl so hard that the head of your dick pokes her in the chin, making her head bounce up and down.

2. Another name for titi-fucking.
EXample 1:
J: "Guess what!?"
C: "What?"
J: "I was poking chin with your sister last night!"
C: " Fuck You.."
J: "HAHAHAHA"

Example 2:
J: *from across the room* " DUDE I WANNA POKE YOUR SISTERS CHIN!!!"

S: " Go ahead! Good for you!"

S and J : "hahhahaha"

J: *slaps C in the face
by mr.meister0902 January 29, 2011
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