It is a metaphor for slow masterbation for an extensive period of time. This often steams up the room of the occupant taking part in the act. Similar to slow stroking it.
“ Jakobsaid to Cody that he put in on a low simmer “
Receiving fellatio whilst your partner is in REM sleep and snoring. This gives a vibrating sensation along with a relaxed throat for a unique sensation.
She drank Rumplemintz tonight and passed out which turned into a wonderful snummer