A physical human wall of guys used to protect yourself from strippers approaching you at a strip club. By strategically placing your self inside this wall of men, you form a barrier. This is the typical approach by committed men so they can feel good about telling their significant others that 'were having a blast, we're two hours outside of wine country honey.'

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

i.e. a wall made of men
when, at a party, a line of tall and mouthwatering men cluster around each other creating the illusion of a wall made out of men. often seen around beer pong tables.