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1.
a small strand of hair (cut from your head) tied with a ribbon or braided into a ring to symbolize love and a very important relationship it kind of like the pre-promise ring
she gave him a lock of love to profess her love and loyalty to him
by Remmy February 12, 2006
 
2.
When one person in a relationship shaves his/her pubic hair and braids it into one of those keychain lanyard things and gives it to the other person.
Mike wanted to take the next step in their relationship, so he gave Karen his lock of love.
by Alaskan Joe (yo ho ho!) September 30, 2005