The idea of "secondend" comes from parlimentary procedure. (or parli-pro for short.)
In all decisions, the members of the group using parli-pro will debate... when a member feels that the everyone has made up their mind, one member with the power to vote must say "motion to (insert action here)". It could be "motion to pass tax", "motion to ban" or "motion to table discussion until such and such. (aka postpone)"
Once one person has made a motion, another voting member must simply say "motion seconded" to show that the first person is not alone in their thoughts. After that, a vote is taken to determine whether or not people feel it's okay to vote... this is not the actual vote, merely showing that your mind is made up. This vote must be unanimous to continue on to the actual vote... otherwise, debating continues.
If the vote is on something simple and obvious, and something that doesn't involve laws and money, then instead of taking a vote, the head of the party can call "acclamation", then all voting parties merely say acclamation, then the speaker will say "any opposition?" and if there isn't more than a person or two that disagree, the motion will be passed. This prevents pointless lengthy debates and taking up time voting on things that have little to no opposition.
So the answer to the question of "the exact opposite of seconded" is simply "there isn't one."
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