A neighborhood cheer mostly performed in the Washington DC area and consisted of rapid and jerking movements of the pelvic area
Did you see the young ladies perform titty bump at the neighborhood block party?
The act of a snorting cocaine off of a woman's breast
Nicole let me do a titty bump off her.
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When going over a speed bump, one's pectoral area might bounce in an animated fashion, causing a titty bump.
"Wow, that was a big titty bump! I think mine touched the roof of the car."