It is an oval piece of vinegared sticky rice, with the fish/shellfish/roe placed as a slice on top. There is usually no seaweed.

The traditional type of sushi, before maki (rolls) became the norm. Many places simply call nigiri "sushi" and rolls "maki", so be careful when ordering rolls that you specify since to many native japanese people sushi translates only to nigiri.

This form of sushi is generally preferred by those who have a taste for raw fish, and it provides a much higher ratio of fish to rice than rolls do. It is also healthier and lower in calories since there is more protein and no fried or mayo'd product.

The most popular is salmon nigiri, closely followed by yellowtail nigiri. Both have a very mild, nearly buttery flavor and so are also ideal for first-timers.

There is also sweet shrimp, which is raw shrimp, and fish eggs (salmon roe or flying fish roe) which are popular options.

If you have so far only had rolls when it comes to sushi, it would be a good idea to try out the nigiri version as well, you might like it more! But be warned, once you're addicted you can never go back.
What I would order in nigiri:
Salmon nigiri
Yellowtail nigiri
White Tuna nigiri
Sweet Shrimp nigiri
Flying Fish roe nigiri

If you are adventurous, try the sea urchin. It's an acquired taste, but has been found to contain the same chemical that makes you high when you do pot.
by eggsoftheflyingfish April 21, 2011
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Girl 1: yo girl did you check out JaMarcus tonight dancin?

Girl 2: yeah he's pretty fly, but he started actin' all nigiri so i had to bounce.
by wu tang playa January 3, 2010
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The sexual act of putting a small ball of rice on a woman’s vagina and eating it off. Soy sauce can be optional.
“Hey are you hungry?”

No thanks. I had a pussimi nigiri a little while ago.”
by VladamirSoldag January 30, 2022
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