1. Sports: This is the most common meaning. It refers to missing a swing in baseball or softball, or missing a shot in other sports.
* "The batter whiffed on the fastball and struck out."
* "The golfer whiffed on his tee shot, sending the ball into the rough."
2. Slang: "Wiff" can also mean to fail or miss an opportunity.
* "I totally whiffed on that job interview. I wasn't prepared."
* "He whiffed on the chance to ask her out."
3. Technical: In some technical fields, "wiff" can refer to a wave interference function. This is a more specialized meaning and is not as common as the other two.
To understand the meaning of "wiff," pay attention to the context in which it is used.