To sexually exite yourself until you reach a climax. With males it involves using their hand to 'jack off', that is holding their dicks and moving their hand back and forth. Females usually use their fingers to rub around and enter the vaginal area.
"His girlfriend was miles away and he was very loyal so whenever he got horny he masturbated to satiate his thirst for sexual activity"
One step up of First Base, heavy petting and feeling up while making out, up the shirt or shirtless for both partners.
"I went though I went to Second Base with him on our first month anni, but it was actually third beacuse I gave him a handjob as well"
The first step in a sexual realtionship involving making out or french kissing
"I don't when when that chick is going to give me some action, it's been a month and we're still only on first base!"
The last base before sex, entailing contact with the main sexual regions, a handjob or a blowjob (fellatio) for guys and fingering or giving head (cunnilingus) to the girl
"we got all the way to Third Base on my friend's roof when I bent down to give him his first blowjob ever"
Performing oral sex on a man, a blowjob i.e. sucking and licking a male penis.
My girlfriend gives me amazing fellatio, she knows exactly what I like.
reaching home base or fourth base is consumating the relationship by having sex, making love or fucking.
"We finally reached home base last night! Thankfully he had a condom on him because we were so horny we couldn't wait any longer"
2. doing nothing, wasting time
"I don't know where her is, he must be off somewhere wanking"