Sai Sai –
“That little crafty one.” (Euphemism given to AIDS in the poor suburbs of Dakar, Senegal.) Also means bad person, “playa”, pimp, crooked business person, etc. Used for men & women. Can be like an insult or badge of pride.
Bin Bins –
A string of beads worn on an elastic string. Senegalese girls typically wear them just beneath the top of their pants or skirts, or sometimes just above. It is considered flirtatious, or even slightly erotic to show one’s bin-bins, particularly to a guy. And if a guy gives a girl a set of bin-bins, it’s pretty clear what that means!