He is starting to smoke his own dope about being a genius.
smoke one's own dope
idiomTo believe one's own lies or posturings.
The manager keeps promising impossible results, and it seems like he has started to smoke his own dope.
The politician became so detached from reality that he began to smoke his own dope, genuinely believing the fabricated statistics he invented for his campaign.
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abound in one's own sense
To follow one’s own inclinations and opinions.
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ace up one's sleeve
A surprise advantage of which others are not aware.
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act one's age
To behave in a manner appropriate to one's age.
- 04
act one's age, not one's shoe size
Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).
- 05
afraid of one's own shadow
Exceptionally timid.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.