Igniting one's own fart. It really does work. The typical "blue streak" is done with the farter sitting on the floor, legs in the air, and holding a bic lighter to the anus while farting violently. It is highly recommended that some sort of clothing be worn when this is done- not only to keep y ou from scorching your anus but also to keep you from shitting all over your friend's lighter.
The 100 day streak with your girl is when you snapchat for 100 days in a row. After you get 100 days in a row, you're supposed to play rock paper scissors to so who is gonna get some first ;)
A 100 day streak determines who is going to get some first. Example: When I got to 100 days with my girl, we played rock paper scissors, and I won so she had to give me head!