hot to trot
Ready and willing, eager. For example, We should let them start putting up posters; they're hot to trot.
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Sexually avid, lascivious, as in He's hot to trot and asked her out almost as soon as he met her. Both slangy usages allude to a horse eager to get going.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.