A bantercheque is one persons recognition of anothers sucess. It can be anything from something as innocent as buying a DVD you wanted, or sleeping with the girl youve been buttering up for ages!!
"Hey John"
"Yeah?"
"you know that girl with the rusty roof i like?"
"yeah, the one with the damp cellar?"
"yeah, her - i finally boned her last night!"
"bantercheque!"