mutual genital stimulation

When you eat dirt for the first time and leave your family to build a shack in the woods

Acronym for Metal Gear Solid. A popular game by Hideo Kojima.

the best grammar school in kent
full of toffs and posh people
can also be used as a term for a posh boy.

Married Guy Syndrome. When a married guy gets so used to the basics (eg. cooking, cleaning, picking up after themselves, etc.) being done by their wives that they forget how to do these things on their own. This happens more frequently when the male in question is a mama's boy that lived at home until marriage.

Mexican girl sluts.

MGs(Mahatma Gandhis) are Indian rupee bills

the reason people call them MGs is because the face on the bill is of Mahatma Gandhi who was
preeminent leader of the Indian independence movement in British-ruled India.