A sus butty is a sandwich that raises immediate and unanswerable questions — something looks off about it, the smell isn't quite right, the filling is an unidentifiable beige, or it was handed to you by someone whose food-preparation habits you have strong reason to distrust. The 'sus' prefix imports Gen-Z suspicion language directly into the British caff context, creating a compound that works as both practical food safety commentary and mild social comedy. Often invoked in workplace settings, catered events, or when eating something labeled only as 'sandwich.'
The buffet had been sitting out for two hours and those egg ones were giving sus butty energy — I did not risk it.
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