get buff, work out, flex your muscles

to unexpectedly exceed the expectations of one's peers in a public setting

having sex with another person

when your female friend has done something wrong and needs to be checked out

To participate in an activity that results in ejaculation. Usually exclaimed, directed at a person. Said person is most likely in a situation that the commentator believes will end in orgasm. "Nut" refers to semen, and thus, to get your nut, is to ejaculate.

When the female counterpart is aware of the meaning of this phrase, it is usually more polite to instead say, "GYN". The female may or may not understand this abbreviation.

To get so intoxicated that walking in a straight line becomes impossible.

To have the sex, to do the sex.