Posting an image file directly on a message board or website without linking to it, or the site that it came from. Leeching tends to be hell on the original site's bandwidth, and it is customary to swap the image for something embarrassing and/or disgusting.
When annoying couples suck face in the hallways during passing period, appearing to cling to each other's lips while walking away as if trying to remove a leech.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.