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3.
Straight piping is an aggressive form of deep throat oral 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!
by Dick M. Down March 13, 2008
 
1.
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
Dam ur car stinks, is it running a straight pipe?

Im running a 3 inch down straight pipe wiht a racing cat back system yo. word
by Thomas Van February 24, 2005
 
2.
Straight piping is an aggressive form of deep throat oral 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!
by Dick M. Down March 17, 2008
 
4.
The act of doing a female without a condom
I gave your mom the ole straight pipe last night
by Dunbar Fuckowski March 28, 2006
 
5.
When you fart with no underwear on. nothing to muffle the sound.
One night me and my girlfriend were doing 69,and with no warning, the loudest straight pipe I ever heard.
by Pete the Plummer February 08, 2004