A verb phrase “[verb] up” meaning someone is easily buying whatever he sees on TV

I came across this phrase “[verb] up” twice on The Guardian Reader’s comments section when readers were talking about someone tends to not raise much objection to whatever the person is told or believes whatever crap showing on TV. Readers there used the verb phrase to describe such people. I tried very hard for two days to recall what exactly the verb was but to no avail. Any idea what this verb phrase might be? Thanks.