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1.
Slexible is when your flexible in a sexual act.

Flexible

Adjective
1.Capable of bending easily without breaking: "flexible rubber seals".

Synonyms
pliant - pliable - supple - limber - lithe - elastic
"Leticia was very slexible last night"
"Leticia is very slexible, she can pleasure herself with her tongue"
by Scientifictree December 11, 2012