A striped racer, also known as the California whipsnake, is a species of non-venomous snake native to the coast and foothills of California. It is a long, slender, and fast-moving snake, identified by its distinctive stripes running down the length of its body. They primarily feed on lizards and small rodents. The scientific name for this species is Masticophis lateralis.
I second that
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The slang meaning is I agree or I support that.
The real meaning comes from parliamentary procedure, the way in which a group of people come together and most efficiently present and discuss possible courses of action, and make decisions. Roberts Rules of Order has been the standard of our government, judicial system, and formal organizations since 1876.
One member may stand and address the chairman. Once recognized, the member makes the motion: I move that/to... and resumes his seat. Some types of motions require another member, without rising, to second the motion: I second the motion, or I second it or even just second. Once seconded, the motion becomes a topic of organized conversation until two-thirds agree to vote. Seconds are important because some topics are not worth the groups time to discuss and a 2nd person means the topic is important to more than one person. Technically, the 2nd does not have to support the motion, they are simply agreeing that it should be a topic of discussion.
Tune in to any congressional session on CSPAN or attend your city council meetings to see Roberts Rules of Order in action.
The Temptations song [I second that emotion] is a pun on Roberts Rules of Order.
I second that meaning & definition 1 of I second that.