When two (Heterosexual) men have each simultaneously eat a separate piece of food. It must be done at a place of work during a break. Only men may do this.
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.