|1.||thumb it in|
When fucking and you get brewers droop or can't manage anything more than a slack-on, one is required to 'thumb it in'
As seen on many porno's
"Fuck me hard Liam", "sorry petlamb, ive gone all soft i'll just have to thumb it in"
|2.||Thumb it in|
To deliver information of some importance via text message. Akin to "phoned it in"
"She told me she was pregnant in a text message. Way to thumb it in. "