lay the lumber
To take a poop; to drop a deuce.
Man, after that dinner I am going to have to lay the lumber!
Laying the Lumber
Bringing your best to an activity or performing extremely well. Used sometimes in contact sports where you are very physical and dominate.
After making a lot of big hits during a sport one would say "DANG! You were laying the lumber out there!" or after getting a very good score on a test you brag to your friends "Yea I just laid the lumber on every single question. That test had nothin on me." OR before an activity a coach might say to his team, "Get out there and LAY THE LUMBER!"