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1.
Used after sentences to express that there is a metaphor in it. It can be generally interchanged with like-clause:

It is X, so to speak.
It is like X.
I love this jacket. I always wear it when I go to work. It is a uniform for me, so to speak.
by terb kund April 28, 2009
 
2.
Follows a statement or phrase, usually to insinuate or indicate sexual innuendo.
Brian likes to do it both ways...so to speak.

Gregory packed a hot lunch today...so to speak.

Alan likes a little duck butter on his kielbasa...so to speak.
by M. Mitchell February 04, 2004