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1.
the word spread refers to the widening of the hips and ass. this usually happens to secretaries, who sit in a chair all day snacking on sweets; thus the name, secretary spread.
"Dayumm, that secretary has a wide ass!" or "I feel like I'm getting secretary's spread from sitting all day."
by Robbie February 19, 2004
 
2.
Tendency of (mainly female) clerical and secretarial staff in large organizations to engage in office romance/sexual activity with superiors as means of professional advancement.

"Women have such low self-esteem that sometimes the secretary spread seems like the only route to success." New York Post
by TexDenim March 02, 2009