Definition of celly in English:
 celly
(also cellie)
nounPlural cellies ˈsɛliˈsɛli
US informal 1
 Timmy whips out his celly to beep Mike
another term for cellular phone
Example sentencesExamples
-  I'm stranded on top of a building with an annoying little boy and a lame celly and I'm bored!
 -  Rasheed Wallace rolled in after the game started, walked onto the court and sat down on one of the benches, talking on his celly the whole time…
 -  He was grinding it again to get a good fide away when the wackest human ever appeared and stood in the line of fire with his celly and a condescending grin on his wack face.
 -  I got my celly out of my pocket and dialed Stacey's number.
 -  The celly vibrates, it's Shelblack: ‘Word up, I'm surfing in Waikiki and skating with Jay Adams.’
 
2(among prisoners) cellmate.
Example sentencesExamples
-  So who do you think would make a good celly for Ogre?
 -  My dangerous new celly's crime spree came to an abrupt end in 1995.
 -  Manny and his celly Scooby were stripped out and their entire cell property was confiscated for 3 days; much to the delight of most of my neighbours who enjoyed the spectacle.
 -  My new celly is a twenty-six year old lad called Long Island who brought with him from Florence some interesting books: he gave me F. Scott Fitzgerald's ‘Tender is the Night’.
 -  My celly, David, is now a satisfied pill-popping inmate.
 
Origin
By shortening and alteration.