A Bloip is a fart that travels upwards towards the front of your legs and eventually exits out of the crease between your inner thigh and nutsack. It usually happens when sitting (often during car rides) and is caused by wearing tight pants. The bloip is characterized by it's unique and often unsettling sensation as you feel the pocket of air travel from your butthole up between your legs, and then "pop" out of either side of your ballbag, either tickling or stinging your scrotum.
Nothing makes your face look quite the way it does after a bloip.
Bloip is the word for the sound a waterdrop makes. When it hits for example a water surface it makes a "bloip" sound.
Therefore, when someone says or type bloip, they mean a waterdrop sound.
The word "bloip" is usually not used in sentences, because its a sound, and not really a word.