1: When an aircraft or other vehicle capable of flight touches the surface of a planet after a period of flight. also: Landed
2: When a football player puts a football onto the ground inside the scoring area while still holding the ball, scoring some points after having avoided being tackled or having the ball stolen from him from a member of the other team.
1a: Nice Touchdown there Captain!
1b: "Houston, Tranquillity Base here, The Eagle has Landed"
2: Jaggar passes to Murphy, dodges past Robson and he's in the clear! Great touchdown there! another three points to the Eagles for 33 to 29.
A term used in online computer gaming to signify one or more kills with a grenade. Mainly applied to first-person shooter games such as Counter-Strike.
Whoa! He just pwned 4 people with that nade! TOUCHDOWN!!
When a guy comes all over the face of his girlfriend while she's inebriated, when she wouldn't usually allow it.
Girl: "omg i have no freaking idea what's going on.. this grass is so soft..."
Guy: ejaculates on face
Girl: sputters and frantically wipes of face "omg I'm drowning!"
Guy: puts it away, zips up pants, runs in circles with arms outstretched like a plane yelling "touchdown!"
The act of taking a shit and jacking off with orgasm happening at the same time as the shit hits the toilet.
I just scored a touchdown in the bathroom.
The act of ejaculating into your partner during sexual intercourse
Male: Oh yeah, not long till touchdown.
It's when you touch a person with Down Syndrome
I was with this girl last night, I gave her a touchdown
The act of taking a poop, usually in the woods when camping when one digs a hole and "touchdowns" in it.
Camper 1: I'm going to go take a walk in the woods.
Camper 2: Be careful where you step, I just touchdowned over there.