A term often mistaken for male genitalia. The correct definition of the word is a modern day 'man bag', or the use of a male friend
to carry female
essentials on a night out/date/general laziness to carry a
handbag. Such items include make up and a purse.
Example 1:
Girl: "You're my man bag for tonight";
Guy: "
Correction. I am actually your man sack";
Rest of group proceeds to laughter.
Example 2:
Girl 1: "
Who is he?";
Girl 2: "I'm not sure, he'd make
a good man sack though".