well it's the usual meaning of pinnacle, except instead of a noun it's an adjective and you don't have to put 'the' in front of it
My grandma was cool. She was pinnacle.
You were trying to write down pineapple and spelt it wrong
Tom: “this pinnacle is so good wth”
Jeff: “Ayo gay wth why tf u havin a orgasm rn”
A pedophile copying Drake's flow + Grooms Middle Schooler
The combination of blumpkin and an Upper Decker! Or Getting head while simultaneously taking a shit in the upper water tank of a toilet.
Dude, you got a blumpkin WHILE performing an Upper decker? Talk about a Pinnacle Solution!
Teacher: Hey boys what are you laughing at.
Boy: The pinnacle of humour