This is the 12568th most frequent Swedish word.
smeknamnet
Nickname.
Here, 'smeknamnet' directly refers to a specific nickname a group of individuals chose to address someone by.
Smeknamnet hans vänner använde var 'Bosse'.
The nickname his friends used was 'Bosse'.
In this sentence, 'smeknamnet' is used to imply the act of assigning a nickname to someone.
Jag gav honom smeknamnet eftersom det passade hans personlighet.
I gave him the nickname because it suited his personality.
Here, 'smeknamnet' is used to signify the emotional or social connection associated with using a nickname.