look up any word, like tribbing:
 
1.
Slang for "urinate".
brb i have to irrigate
by burstroc April 16, 2006
 
2.
The act of a man ejecting sperm from his penis into the top of a woman's vaginal lips. The sperm then runs toward the woman's vagina and goes inside.
Tom: Tonight I am going to irrigate into Lisa.. I hope she won't be preggers!
by froggyman178 December 21, 2010
 
3.
To mess with the ground to make the land fertile to grow crops and things of that nature.
I will irrigate this land for farming and crop raising
by Michael April 04, 2005