ButterflyYTES 

ButterflyYTES is when you have so many butterflies in your stomach it hurts

He was flirting with her too much and gave her butterflyYTES

ButterflyYTES by Ms_Girl February 18, 2021

Butterflyitis

Spasm of the stomach muscles, usually in males, when talking to, or thinking about a girl who means the absolute world to them.

There goes F*&^...ouch, my butterflyitis is playing up again

Butterflyitis by DoctorG007 March 27, 2011