After a man ejaculates into his partner’s buttocks or vagina, his partner then holds it inside retaining the warmth. Then at later period of time, the person whom received the ejaculate does a quick split type motion of their legs, reigniting the heat from the ejaculate inside.
"its cold out here, im going to crack a glow stick and warm up"

samantha got so cold that she had to "crack a glow stick"
by Azmogorf May 31, 2009
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