big telly pokey bum wank
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.