A person of poor social stance and social skills.
They stare at you on public transport.
They have generaly bad odour, behave like sheep and have no comprehension of the phrase "You get what you give"
A substitute for the word fuck... Very versatile and can be used with any given appendage.
"Holy fuck!- That dick-cheese is the biggest squag I ever met, what with his mangled face and all."
"Squag off you bollocking squag stain"
'"Squag you, squagging squag faced squag squag!"