An E-sum is when 3 people whether it be 2 men and 1 woman or 1 man and 2 women or even 3 women have a conversation on a forum which is filled with sexual quips and tension.
1) Hey Candy how about you and I have an e-sum with Kemi on our forum?

2) Vade - Hey Dick, why don't we try to have an e-sum with Shalz?

Dick - Wow! Sounds like a wonderful idea, Vade.
by simply da best December 1, 2009
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