English Slang Collection：
go mental
[釋] to suddenly become extremely angry;
[例] They will definitely go mental if they are left alone for long periods of time.;
gommer
[釋] geek, nerd, or weirdo;
[例] Mike is such a gommer that he never gets tried of working on his computers.
gone
[釋] to be drunk beyond recognition of whats wrong or right;
[例] That guy at the party last night was completely gone.;
goner
[釋] someone or something who will die soon;
[例] This table is a goner, we should really just get rid of it now.
gong show
[釋] a hockey game or something that went all wrong;
[例] Yesterday at work was a total gong show, nobody knew what was going on.;
gonna
[釋] be going to;
[例] Don't worry, sis! I'm gonna fix that broken kitchen door for you this afternoon.