g is a full for for guy. This is mainly used (always) when you address somoni who you are "grateful" of or when you want something. This is a slang used in Britain a lot. (Please the way many Americans use this makes me cry, please use it when you know how to. Applaud American's who know how to use this)
" I like your cut g" , " Aywag1 my g" , "my g" , "pass me the ____ g"
In the Philippines, 'g' is a short term for 'game,' which is used by gamers, it can also be used to ask 'are you coming?' and can also be used to say 'yes, let's go.'