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Phrase(s): lap something up
1. Lit. [for an animal] to lick something up. • The dog lapped the ice cream up off the floor. • The dog lapped up the ice cream. 2. Fig. [for someone] to accept or believe something with enthusiasm. • Of course, they believed it. They just lapped it up. • They lapped up the lies without questioning anything.
McGrawhill's American Idioms And Phrasal Verbs
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Take in or receive very eagerly, as in She loves to travel? she just laps it up, or The agency is lapping up whatever information their spies send in. This expression alludes to an animal drinking greedily. [Late 1800s]
American Heritage Idioms