No, this has zero to do with the sound you make when something's tasty...
Would it be .....
forms? four Ms.
Looks like it's probably
Forums (4 M's)
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$\begingroup$ I just noticed this -- double sniped!! (+1 for you too!) $\endgroup$ – El-Guest Aug 17 '18 at 18:58
Thinking the answer could be
m&ms?
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1$\begingroup$ @Wordster No, the answer is valid in my opinion: MMMM = M+MMM = M&Ms $\endgroup$ – xhienne Aug 17 '18 at 19:24
Is the answer (extra text)
Forums?
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1
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1$\begingroup$ I think it's between you and Sconibulus in either case...good luck to both of you! $\endgroup$ – El-Guest Aug 17 '18 at 18:59