These are toy
model kits familiar to
tinker toys,
kinex, and
legos. Most of the time*, if you hear anyone over the age of 13 and not the parent of a 10-year-old referring to them, it's about the
penis and its
many functions.
*I was proven wrong about this when a 16-year-old friend of mine told me a story about when he moved here last month and the couch legs turned up in his erector set's box. I'm still letting that one sink into my brain.