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The small amount of wet shit that ends up in male underwear after urinating, usually caused by farting or a relaxed anal sphincter.
Mom: "Goddamit it Sol, look at this blow by in your underwear!"
Son: "Oh fuck you, just do the laundry and shut up."
Mom: "I swear Sol, sometimes I don't think you're my son, or Jewish, or enrolled at Penn."
Son: "Suck my soulja boy, Mama."
blow by by SollyTude August 9, 2008
Related Words

blow jobligation

After a nightmare weekend with Suzie's insane fucking family she accrued quite a store of blow jobligations.
blow jobligation by WubbaRocks March 2, 2011

Blow Cake 

A small birthday cake purchased in additional to the regular cake. This cake is used to absorb the spittle blown when the celebrant blows out the candles, leaving the actual birthday cake uncontaminated so that all guests may enjoy it.
We had better get a blow cake for Uncle Lester's birthday so that he doesn't ruin everyone's cake like last year.
Blow Cake by The Chicago Kid June 18, 2011

Blow Horn 

The legendary, and most deadliest weapon to ever exist. Only the fattest and mightiest of the Akimichi may wield this ancient power. One shot from this, and an entire planet could be destroyed in an instant. How this works, is that the chosen weilder has a special type of fart gas, and when released, it can cause mass destruction. Basically, it is like a nuclear bomb that can be shot out of your booty, except it is 1 trillion times stronger.
Breaking News: A castastrophic Blow Horn Type 5 has destroyed planet Moksus.
Blow Horn by BigBabyShrek November 17, 2018

blow up the clown

to shit on the floor of a public bathroom
we gotta get out of here before the attendant checks the bathroom.

i couldnt sit on that dirty toilet, had to blow up the clown in there
blow up the clown by abitasprings January 19, 2009

Blow me a raspberry 

Having sex with a girl on her period then having her give you a blow job.
Yo, I just made that girl blow me a raspberry.