GGG stands for Good, Giving, and Game. More specifically: good in bed, giving equal time and equal pleasure, and game for anything—within reason. The term was coined by Dan Savage, gay author and sex advice columnist for the Stranger.
The opposite would be someone who is shitty, selfish, and totally square in the sack.
When you start to die of boredom and maybe your internet even is gone so you start to type mmm nnn bbb vvv ccc xxx zzz lll kkk jjj hhh ggg fff ddd sss aaa ppp ooo iii uuu yyy ttt rrr eee www qqq, which is typing your letters on the QWERTY keyboard from first to last, but you type every letter 3 times.
Nickname for Kazakhstani Boxer Gennady Gennadyevich Golovkin. He is currently the worlds best active middleweight boxer (as of February 2018) by the Transnational Boxing Rankings Board (TBRB), and holds many titles such as the IBF and WBC middleweight titles. Some rank him as the best middleweight active boxer as well. He has fought in 38 matches but only drew one against Saul "Canelo" Alvarez, who he will fight again in May 2018.
Mark: Who's the guy in the ring named GGG?
John: That's Kazakhstani Boxer Gennady Gennadyevich Golovkin. He has a long name so they use GGG instead.
Mark: Oh wow!
An internet meme appearing on 4chan, Reddit, and other sites about the classiest guy around. The meme involves a photo of a smiling, confident, stubbled guy smoking a joint and giving a friendly reassuring look toward the camera. On top of this photo, people will write of Good Guy Greg's classy deeds. He borrows your car and returns it with a full tank of gas. He parties with you on your birthday but never tells anyone about how you puked on yourself. He comes over for dinner and washes the dishes. He is better than you in every way, but never talks about it and makes you feel better about yourself instead.