Greek word denoting the act of inserting a finger (dahtilo) into someone's ass kolo.
The finger of choice is usually the middle finger, however this largely depends on personal preference or reach and position.
"She loves the kolodahtilo when she is having sex!"
"While we were at it, she surprised me with a kolodahtilo - it was great!"
"The Pousti loves the kolodahtilo!"