To make a loud audible sound of joy, satisfaction, or pleasure. A few examples of why one might let out a Colombian Airhorn are as follows:

1 winning the lottery
2 having explicit climax(es)
3 inhaling Colombian snowflakes

Despite contrary beliefs, the name does indeed derive from the little known facts that Colombia is known for it's snowflakes, while air horns are known for their loud audible noises.

When someone goes to the gym and spends 90% of the time on their phones scrolling through social media