In a sexual context : it involves inserting a (pealed) banana into a girls rectum prior to engaging in anal sex. Afterwards, a bowl is used to catch the result, a lukewarm mixture of jiz, mushed banana and excrement.
Doing a Banana split is quite popular in latin-american countries. A friend of mine did one in Cuba the other day.
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to perform oral sex on a male while the partner has ice cubes (or crushed ice) in her (or his) mouth.
When properly executed, this is quite a treat.
It would seem Sarah gave him a Siberian special, he was quite pleased.
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