It is a locution, but depending on the context it can have different meaning, which will also depend on the place of origin, since in some places articles or prepositions are added that in others are omitted, not to mention the use of different verbs to express the same thing. Meanings can range from "facilitate a task, make it more enjoyable, less costly" to "hurt, humiliate and subdue someone"; In the first case it is inspired by how easy it is to feed chicken eggs in rural areas, and the second has a sexual connotation because it refers to . . . insert up to a testicle. In the middle we find meanings such as "put will, strength and effort in something", which among men is to demonstrate in a task the manhood represented by the testicles; Or it could also be a variant of "putting the egg" as if the greatest effort someone makes was to scratch the scrotum. See put, egg, put egg, make egg, make egg, make some egg, make egg, put egg, put eggs, put someone egg, egg, wiwi.