cum guff

A fart or burp containing a gentleman's semen

Adam had been enjoying an evening of cottaging when he let rip a massive cum guff

Biryukova

A very loud and objectionable burp, usually accompanied by no apology and instead an insult is hurled from the same mouth

Mr Smith let rip a Biryukova at the Oxo Tower, Mrs Smith objected but was immediately told, 'what the f*ck - whatever'