the act of female masturbation.

can be used as an insult as well as a verb in the same way as wanker is used both as a pejorative and to describe the act of a man masturbating.

drving fast

When bicyclists, namely fixed-speed riders, dip and weave quickly through cars, skid through them, or a combination of the two.

Mashing is a term commonly used to describe frotteurism. Frotteurism is a type of paraphilia involving sexual urges or sexually arousing fantasies involving bumping or rubbing against a stranger and/or a nonconsenting person for sexual gratifucation.

Combining usually internet or other types of videos whilst some times incorporating music to create a new video that either may be centered around one more themes, or merely to show all of the videos together.

The act of strolling into your local supermarket and heading toward the fruit and veg section. Where you start to masturbate yourself as vigorous as possible, ending with a creamy substance left all over the potatoes, much like Planking became an internet sensation many have taken to Mashing in much the same way.

hittin a HOMERUN!! (4th base).. the process of sexual intercourse!
See: my bedroom on a weekend... haahha