A very complicated mathematical ideology as explained in part A: But best explained and used in Part B.

A: In mathematics, a binary relation R over a set X is transitive if whenever an element a is related to an element b, and b is in turn related to an element c, then a is also related to c.

Transitivity is a key property of both partial order relations and equivalence relations.
B:I touch my balls, then I touch your forehead. By definition of Transitive Theory my balls have now touched your forehead.

-Go forth and enjoy your new found powers of Transitive Theory
by St. Pierre Holland March 29, 2009
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The meaning is two-fold.

1. There will always be another girl/guy after you're done with one. Just like a bus stop, there's always one coming 15 minutes later.

2. A 'dry spell' is much like a bus stop. Sometimes there won't be a bus coming through for awhile, then all the sudden, BAM there's 4 buses. Same thing with a dry spell, you go through a long time of no action then BAM multiple people are interested in you.
Derek: Jessie broke up with me! There's no women for me!

Jeter: Dude, trust in the Public Transit Theory.
by brojo April 6, 2012
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