Generally bowags are made from nasal mucus as salava alone is not usually strong enough to form a good bowag unless there is a head cold present. Bowags can be started in one of two ways.
1. Grab a thick piece of snot from a nostril and slowly pull as much mucas as possible. If attached to a clinger they may be some nostril tickling and uncontrolable eye twitching. A good bowag can be made at this point but the goal is to get the snot to break from your nose and then 'drip' from the fingers without breaking. Et Voila, a bowag is formed which can be nurtured or discarded.
2. Stick one finger on one side of your nose to close the nostril and blow hard. Cup you hands and catch the mucus in your fingers. Continue as above.
Once a bowag has been made it can be flicked onto a overhanging object of your choice. This inturn becomes a stringy bowag which are usually much longer than a standard bowag due to the extra height from point of origin and the floor. When flicking care must be taken so the bowag does not become entangled with oneself.
Bowags should never be made of poo.
That bowag is going to drop any minute and land on that nun's head.
Dude that is a class A bowag!