having it
This phrase can mean a lot, perhaps to much. In some circumstances it can be the same as 'have it' but of course 'having it' is somewhat in the present tense. So perhaps think of 'having it' as a outburst response to having extreme fun, mostly summoned for circumstances of a sexual, drug consuming, party time!
The Urban Dictionary Tee

Happy that this tee is comfy and fits well. I wish the sentence was on the back too.
My wife absolutely loves her new T-shirt.
This looks like a weird design but it looks cool
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Size Guide
Measurements may vary by up to 2" (5 cm). Pro tip: Measure one of your t-shirts at home and compare!
A - Length
Measure from the top of the collar to the bottom hem
B - Width
Measure across the chest from armpit to armpit
Size Chart
| Size | Length | Width | 
|---|---|---|
| XS | 27" | 16½" | 
| S | 28" | 18" | 
| M | 29" | 20" | 
| L | 30" | 22" | 
| XL | 31" | 24" | 
| 2XL | 32" | 26" | 
| 3XL | 33" | 28" | 
| Size | Length | Width | 
|---|---|---|
| XS | 69 cm | 42 cm | 
| S | 71 cm | 46 cm | 
| M | 74 cm | 51 cm | 
| L | 76 cm | 56 cm | 
| XL | 79 cm | 61 cm | 
| 2XL | 81 cm | 66 cm | 
| 3XL | 84 cm | 71 cm |