A dogger is a person who engages in the act of dogging. Dogging is a British English slang term for a person who engages in public sexual acts, including watching others.
One who participates in the rather dubious activity of standing around in the bushes in remote areas watching young couples have sex in their cars. After a good watch, they whip out their penises and have a group circle jerk, to build camaraderie between fellow doggers..
Look!! It's afilthy dogger!! Over there in the bushes!! Quick! Get the axe!!
A "dogger" is someone who usually puts someone down. Someone who get's a kick out of roastingsomebody on either their apparel, physicalities, or personality.
"Dude, I was talking with Jalyn the other day and I can't believe. Every single time someone walked past, he'd have something to say"