An activity (often following bubble-gut inducing meals) in which a pair of friends settle themselves in adjacent stalls of a bathroom and defecate. (Abbreviated for "tandem"), a Tandy is a social connection, bringing friends closer, as the quiet environment of a bathroom is conducive to long conversations; usually outlasting the defecation itself.
Rob: Dude, Vanessa's dumplings were awesome but I think I'm gonna shit myself.
James: There is a Starbucks nearby with two stalls...a Tandy is in order.
