The point of temperature play is to provoke arousal by using the skin's neuroreceptors. Stimulation through heat or cold gives the body a rush of sensations that, during foreplay, is translated into arousal. Temperature play is especially fun when hot and cold are combined together in unpredictable patterns (for the receiver).
Objects that retain temperature (such as those made of metal) can also be used after they have been chilled or heated. More intense or extreme forms of temperature play (usually involving fire), like cupping and streaking, are more frequent in BDSM activities.
Typical (and safe) temperature play techniques involve ice, melted wax, metal that has been chilled or warmed, and hot or cold food.
Girl 1: Hey, what are you and your boyfriend into in the bedroom, if you know what I mean?
Girl 2: In the bedroom...? Oh! Um, me and my boyfriend like to do temperature play sometimes. It's really pleasurable, you should try it with your boyfriend!
Temperature tantrum: When you get cranky and pissy because it's so uncomfortably hot. The temperature-mood based equivalent of being hangry.
It's 75 degrees in here. Why are you wearing a robe and sweatshirt? How are you not hot? The fan is NOT putting a chill in the air. You better put the AC on to 66 before I throw a temperature tantrum.
When someone takes a screen shot of their weather bug screen or dashboard of their car to show everyone how warm or cold it is where they live. Nobody likes temperature selfies or the people that post them on social media. Typically the people who take this type of a selfie are extremely lonely or lack a social life. Every one knows what the temperature is where you live deutchbag.