When the catalyic converter is taking out of the car to reduce back pressure and increase performance. It is illegal though, only if u get caught. it would be hard and almost impossilbe to pass smog check also
1 (noun, automotive): An exhaust system mod in which all mufflers and catalytic converters are removed, literally having a "straight pipe" as your exhaust. Doing this will increase noise and free up HP. It is very illegal almost everywhere except in M town
2 (verb, informal, sex): {aggressive], rough, hard sex, usually used to describe rough oral sex, face fucking
1: God damn it I'm sick of hearing my neighbors straight piped Honda everyday at 3 AM
2: He Striaght piped me and now my neck is sore
Straight piping is an aggressive form of deep throatoral sex. This is when a girl lays on her back on a bed (or some other object) and tilts her head back over the edge so her throat is no longer at an angle. In effect, it forms a "straight pipe." Often seen in pornography.
Yo man I banged this girl last night, she was like a pornstar dude! She even let me straight pipe her!