To simultaneously finger a girl's vagina and play with her boobs from behind, hence looking like you are playing a cello.
"I blacked out, and when I woke up I was fingering her and playing with her tits! It was like playing a fucking cello!"
by ZeeFancyMan September 16, 2009
Pronounced "chello," like the musical instrument. It is cellular phone for short. Sometimes used in place of celly.
I got this fresh new ringtone on my cello so I can know when your mom's calling.
by TStorm April 29, 2007