Pulling a grant

when someone at the beginning of a class takes the hall pass and leaves for the period only to return when there are five minutes left

person 1: Mr. ___, can I please take the pass?
Teacher: ok (Person 1)
You: Oh man (person 1) might pull a grant today

Scenario 2

*person has been gone for 40 min.*
You: looks like so-in-so is pulling a grant again, it's the third time this week!

Pull a Grant

When a "not so popular" guy uncontrollably ejaculates in their pants. Normally when a nice looking girl is talking to them, or even near them.

-Oh man, did you see that freshman totally Pull a Grant when Chrystal walked past?
-Haha, what a loser!