The insertion of your finger or object into your rectum whilst masturbating / jerking off, to increase pleasure while watching pornography or sexually stimulating broadcast material to enhance the experience, either on television or vvia internet streaming on computer, smartphone or tablet.
He was so aroused by the two lesbians performing cullingus on each other on late-night television, he couldn't resist giving himself a big telly pokey bum wank.
The act of cranking one out involving the use of the largest screen in the house (usually the TV in the living room) to watch pornography.
I'm sick of squinting at my phone screen in the toilet while the missus is home. I've got the house to myself tonight so I'm going to crack open a can, get pornhub up on the 60" in the living room and have a nice big telly wank.