The original expression was “Butter wouldn’t melt in his/her mouth”. What this means is when you find someone, a child or animal who is quite obviously responsible for some misdemeanour and they deny it and look at you with an expression of angelic innocence and, in spite of all the evidence continue to lie, that’s when you say that Butter Wouldn’t Melt.
“It wasn’t me that broke the jug, it was the dog.”
“We haven’t got a dog.”
“It came in from outside, it wasn’t me.”
“Oh yeah, and I suppose butter wouldn’t melt!”
“We haven’t got a dog.”
“It came in from outside, it wasn’t me.”
“Oh yeah, and I suppose butter wouldn’t melt!”
by AKACroatalin April 10, 2019

The lesbian sex act in which two women are engaged in tribadism and one, both, or a third party pours melted Velveeta cheese in between their two vaginas. The sound produced is nothing short of exquisite.
Cindy and I got really hungry last night so we popped some Velveeta cheese in the microwave and made ourselves a vagina melt sandwich.
by Ryan J B September 25, 2005

It’s a fucking fish sandwich with cheese and a blend of southern spices. You dirty internet perverts...
Me: I met up with this girl last night and we had an Alabama Tuna Melt.
Guy 2: What the hell is wrong with you?!
Me: Wha.. EW GROSS!! Not that crazy shit!! We shared a sandwich!! You sick fuck!
Guy 2: What the hell is wrong with you?!
Me: Wha.. EW GROSS!! Not that crazy shit!! We shared a sandwich!! You sick fuck!
by .&:&3&83 March 18, 2019

Its when a female is so in to you , by what someone does or what someones says , they feel their heart warm up.. Also applies to things cute kids do ...
by Joefullymonty February 7, 2014

by Pogo56 December 9, 2008

an amazing way to say i love you and you mean everything to me, originated from frozen when olaf said this to princess anna
by sum ppl aren’t worth melting 4 April 3, 2021

"Dude, Terry told me he indulged in a Tennessee tuna melt with Crystal last night, right after Jim Bob fucked her. Gross."
by Terrence Horace February 1, 2018
