A "two man" refers to when one of your friends wants to hang out with a woman, but the woman insists on bringing her friend. You then tag along with your friend to help prevent a potential cock block.

if a guy asks if you "want to get two manned", he wants to have a threesome with you with another man

The most homoerotic of all sports.
When a man lays on top of another man and they slide down an icy tube together on a sled at 70mph

A urban area where more than one utility technician is required for the purpose of safety. A.K.A. "Designated Area"

When you and another friend roll a blunt,a Marajuana filled cigar wrap, and smoke it only between the two of you. This is usually caused by both persons not seeing the other in a long while. Or just because theres two of you and a joint just wont do.

When two guys go to the toilet at the same time. One is sitting on the toilet seat in the usual fashion, and the other sits on top of him, facing him, and shits between his legs.

Two man saw refers to when 2 men engage a woman in a sexual act. She gives oral while receiving a man's genitalia from behind. Thus, resembling a two man saw.