Altissimus 

A shit-tastic hardcore "band" that prides itself on creating complete ear-rape with electric instruments.

Jim: Man, Altissimus really sucks my asshole dry!
Chris: Altissacore is ten times better.

Altissimus by Phat Pail January 1, 2012

altissimo 

Playing ridiculously high on an instrument.

Dude 1: I can play altissimo!!
Dude 2: I can't. You piss me off.
Dude 1: Overtones!
Dude 2: What.

altissimo by bootysaxlick January 11, 2014