A person who lives in a damp region such as a bogland or swampy area. This refers to the noise their feet make when they walk. Predominanly found in Northern Ireland around the South Eastern shores of Lough Neagh in the Gawley's Gate locality.
That fellow might live in the town now and be relatively civilised, but he was once a bog trotting squelchy....you can tell from the wellingtonboots and dungarees tucked inside.
An Extremely Moist Vagina - When a vagina becomes very moist that when being penetrated with objects or part of the anatomy its makes a noise that sounds like 'SQUELCH'