More suitable for belonging to a club, or more friendly and social in a club-like way.
From 'clubby' (adjective meaning sociable or club-like) plus the comparative suffix '-er,' which forms comparative adjectives (like 'bigger' from 'big').
If someone's personality becomes 'clubbier,' they're becoming more inclined to join groups and be social—it's the opposite of becoming a hermit, and it's surprisingly trackable in how people change over time.
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