To fold the corner of a page, usually a book. The purpose is usually for bookmarking. Dog-earring is one of the worst things you can do when reading because you ruin the paper as a result and anyone else who reads the book will either be confused by your bookmarks or think that the book is in lower condition.
Teacher: I need these books in the samecondition as I gave them to you. Please for the love of God DO NOT dog-ear your books! If you need to bookmark, use an actual bookmark.
Tits that look like they have been pressed flat and have a wide connection at the body and narrow ending at the nipple, triangular in shape.
Richard "That girls tits look like a basset hounds ear. "
Greg "I'm sure she has a small litter of kids so they had milk then deflated forming Dog Ear Tits"
It's when someone who you really like or care about treats you like shit but acts like you're everything to them when you're all they got. Yet, once they have other people they "Put a Dog-Ear on your page and move on." it really sucks to be one...
Girl: Hey...Drew just dumped me....Want to go out again?
Guy: Fuck this! I'm done being your Dog-Eared Page!