“ 情圣 ” 是 “ 调情圣手( tiáo qíng shèng shǒu )” 的 简称 — 能够说是恋爱的高手 ( great lover — Don Juan)
It probably refers to a person who is adept at the arts of love and relationships. Literally more or less "Love/Romance Master," "Love Guru". So in way we can understand it to be a "player" too.
A good way to figure out certain Chinese word groupings is to look up each character and often you can piece together at least part of the meaning.
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