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Random
When your partner inadvertently or un wantedly tickles and or penetrates your anus with one or more fingers.
"Yo yo baby stop! I aint into no K-west finger bump"!
When two people finger the same vagina at the same time; and touch hands whilst inside said vagina.
May or may not include eye contact between the two fingerers making eye contact.
It was so cool when we finger bumped inside of Barbara whilst in the bus the other day.