A magical grouping of numbers and letters used to denote pre-advertised tumblr users from nubs.
Generally placed in the about me section.
There is an ongoing debate as to weather or not this is fair, since everyone was once a new tumblrer.
person: fuck! MTV is advertising Tumblr!! The world is ovvverrr!
other person: how will we separate old tumblr users from these newfags?!
other person: 5T4S it is.
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