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1.
when an disagreement or argument, between two people, happens in real life and one person unfollows the other on instagram as a result.

aka. the universal signal of an ended friendship
Example 1:
person 1: "i had a fight with matthew and he unfollowed me on instagram"
person 2: "he's bloody pulling a carlto"

Example 2:
girl 1 (to girl 2): "you're such a nincompoop"
girl 3: "be careful or she might pull a carlto"