A small, cone shaped, rolled up strip of cardboard which is placed at the mouth-end of a joint, often made out of the little flap on rizla boxes. A roach serves various purposes, it;
- Stops your weed fallin out
-If someone bums it (slobers on the end) it stops the soggy paper from falling apart
-It gives your spliff a standard cone shape, which is almost impossible to achieve without a roach
'Aye yo man, iz u got a roach?'
'For real' *rips strip off rizla box lid