the.com/smattering

Just enough knowledge to be dangerous at dinner parties, not on exams.

means A small, scattered amount of something—especially a superficial or incomplete knowledge of a subject.

from Traces to the 16th-century verb 'smatter,' meaning to talk ignorantly or superficially about something—to chatter on a topic you barely grasp. That verb likely echoes other '-atter' words suggesting light, scattered impact or chatter (akin to 'smack' or 'spatter' in feel, if not confirmed lineage). The noun 'smattering' grew from this to mean the thin layer of knowledge such chatter actually reveals—just enough to talk, not enough to know.

etymology
from obsolete verb smatter, to chatter superficially
implies
breadth without depth, confidence without mastery
usage tell
always modest, never used to brag
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