When someone is bad at throwing a ball in sports.
"Nice throw, custard arm."
"What is Jono doing, he's got the biggest custard arm ever."
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Having fat arms, the fat usually hangs from the arm - the same as lunch lady arms
Man, check out that fat piece of shits custard arms
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What you say shout when someone fails to catch an item you throw to them, like keys, balls, a small bag etc.
The arm equivalent of 'Spaghetti Legs'; someone with ‘Custard Arms'.
Person 1: ‘Go Long!’ *throws item*
Person 2: *catches, and tries to hold onto it before dropping it.*
Person 1: ‘Good arm, Custard!’