SEU "Semen extraction unit". A very attractive adult, usually female, designed specifically for the purpose of extracting semen from both unsuspecting and suspecting men.
Pamela Anderson is a role model for all women aspiring to become SEU's.
by NGEOGUY March 28, 2007
Abbreviated or slang form of the word SERIOUSLY.
We are experiencing SEU good weather today. That joke was SEU funny!
by Logan Richmond September 02, 2005