The act of lifting one's breast by using the muscle of one's tit.
The lady did a titup to to inspect a mole underneath her breast
by airjordan0424 July 9, 2015
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When mamary glands on a woman's chest move up a cup size.
When I first dated Samantha she had D cups, now she is down to a B cup.

Man, that girl better titup!
by Juanchoyuc October 21, 2010
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