Jerk off
Definition 1 of 2
Pro Tip 1/3Highly Informal
The phrase is very casual and often considered vulgar or offensive. 
He joked about needing to jerk off after a long trip.
Pro Tip 2/3Adult Content
This phrase relates to an adult activity and should be used with caution. 
The movie had a character who would jerk off, making it inappropriate for children.
Pro Tip 3/3Sensitive Contexts
Avoid using in formal or respectful settings like work or family gatherings. 
He quickly changed the subject when his friend mentioned jerking off during dinner.