What does Serena mean by "sexual Drano" in Gossip Girl?!

Question: What does Serena mean by "sexual Drano" in Gossip Girl!?
Answers:

Because Chuck can't get it up unless he is sleeping with Blair and Drano unclogges drains she calls it sexual Drano because Chuck is clogged down their and Blair is the only one who can "unclog" himWww@Enter-QA@Com

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