A "Wad-snogger" is a Nerd/Dork with an Alpha-Type Attitude.
A "Wad-snogger" can also be a derogatory term to describe a "Sissy Bitch." (Only in certain cases can the Word be appropriate.)
James is such a Wad-snogger. His inability to get girls will forever haunt him.
Jessica: Hey, did you hear?
Alice: no...
Jessica: Danny is a "Wad-snogger"
Alice: wtf