Morning oak 

Morning wood of abnormal size and rigidity, impossible to "tuck" away and often quite painful

Today I woke up with morning oak that I could have used to fuck a sea lion with. I thought my dick was going to explode.

Morning oak by Skid Mark VZ June 30, 2007

Morning Oak 

Getting up in the morning up with the strong desire for whiskey before your fully awake.

I had a hard case of morning oak this morning but the liquor store didn't open before work.

Morning Oak by rm2001 May 22, 2010