In the context of an online videogame, a Gaygar is a person and/or people who often verbally assault other individuals after beating them in a certain competitive or casual game using cheats/exploits, disrespectfull strategies or overpowered tools to help them achieve the victorious result. These players are often able to be beaten quite easily by more skilled/experienced individuals. One earns the right to call someone a Gaygar after beating them in a player to player engagement while the defeated person has been confirmed to be disrespectfull.
"Oh bro, that Jonas165 guy is such a Gaygar, he camps all game!"
To plow a gagger is slang for snorting a large line of Cocaine or Crystal Meth. Plowing comes from the size of the line being too large to snort at a normalspeed so the user accidentally 'plows' the line with the straw, moving the drug rather than snorting it up the tube. Gagger comes from the action of gagging that is often associated with snorting a line of this magnitude.