Sexy time has begun refers to one of the two;
1) When someone wipes out a squad, team or comp in a game or comp.
2) When a Man/Woman engage in sexual intercourse with another partner.
Wow, we just wiped their entire team, sexy time has begun
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1) refers to when ether you wipe out an entire squad, team or comp in any games
2) When a woman/man has entered the art of sex with a partner.
Wow, we just wiped out an entire team, I guess sexy time has begun.
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